neovim/runtime/doc/vvars.txt

*vvars.txt*	Nvim


                NVIM REFERENCE MANUAL


Predefined variables                                             *vvars*

Some variables can be set by the user, but the type cannot be changed.

                                       Type |gO| to see the table of contents.

						*v:argv* *argv-variable*
v:argv
		The command line arguments Vim was invoked with.  This is a
		list of strings.  The first item is the Vim command.
		See |v:progpath| for the command with full path.

						*v:char* *char-variable*
v:char
		Argument for evaluating 'formatexpr' and used for the typed
		character when using <expr> in an abbreviation |:map-<expr>|.
		It is also used by the |InsertCharPre| and |InsertEnter| events.

			*v:charconvert_from* *charconvert_from-variable*
v:charconvert_from
		The name of the character encoding of a file to be converted.
		Only valid while evaluating the 'charconvert' option.

			*v:charconvert_to* *charconvert_to-variable*
v:charconvert_to
		The name of the character encoding of a file after conversion.
		Only valid while evaluating the 'charconvert' option.

					*v:cmdarg* *cmdarg-variable*
v:cmdarg
		The extra arguments ("++p", "++enc=", "++ff=") given to a file
		read/write command.  This is set before an autocommand event
		for a file read/write command is triggered.  There is a
		leading space to make it possible to append this variable
		directly after the read/write command. Note: "+cmd" isn't
		included here, because it will be executed anyway.

					*v:cmdbang* *cmdbang-variable*
v:cmdbang
		Set like v:cmdarg for a file read/write command.  When a "!"
		was used the value is 1, otherwise it is 0.  Note that this
		can only be used in autocommands.  For user commands |<bang>|
		can be used.

					*v:collate* *collate-variable*
v:collate
		The current locale setting for collation order of the runtime
		environment.  This allows Vim scripts to be aware of the
		current locale encoding.  Technical: it's the value of
		LC_COLLATE.  When not using a locale the value is "C".
		This variable can not be set directly, use the |:language|
		command.
		See |multi-lang|.

			*v:completed_item* *completed_item-variable*
v:completed_item
		Dictionary containing the |complete-items| for the most
		recently completed word after |CompleteDone|.  Empty if the
		completion failed, or after leaving and re-entering insert
		mode.
		Note: Plugins can modify the value to emulate the builtin
		|CompleteDone| event behavior.

					*v:count* *count-variable*
v:count
		The count given for the last Normal mode command.  Can be used
		to get the count before a mapping.  Read-only.  Example: >vim
		  :map _x :<C-U>echo "the count is " .. v:count<CR>
<
		Note: The <C-U> is required to remove the line range that you
		get when typing ':' after a count.
		When there are two counts, as in "3d2w", they are multiplied,
		just like what happens in the command, "d6w" for the example.
		Also used for evaluating the 'formatexpr' option.

					*v:count1* *count1-variable*
v:count1
		Just like "v:count", but defaults to one when no count is
		used.

					*v:ctype* *ctype-variable*
v:ctype
		The current locale setting for characters of the runtime
		environment.  This allows Vim scripts to be aware of the
		current locale encoding.  Technical: it's the value of
		LC_CTYPE.  When not using a locale the value is "C".
		This variable can not be set directly, use the |:language|
		command.
		See |multi-lang|.

					*v:dying* *dying-variable*
v:dying
		Normally zero.  When a deadly signal is caught it's set to
		one.  When multiple signals are caught the number increases.
		Can be used in an autocommand to check if Vim didn't
		terminate normally.
		Example: >vim
		  :au VimLeave * if v:dying | echo "\nAAAAaaaarrrggghhhh!!!\n" | endif
<
		Note: if another deadly signal is caught when v:dying is one,
		VimLeave autocommands will not be executed.

				*v:echospace* *echospace-variable*
v:echospace
		Number of screen cells that can be used for an `:echo` message
		in the last screen line before causing the |hit-enter-prompt|.
		Depends on 'showcmd', 'ruler' and 'columns'.  You need to
		check 'cmdheight' for whether there are full-width lines
		available above the last line.

					*v:errmsg* *errmsg-variable*
v:errmsg
		Last given error message.
		Modifiable (can be set).
		Example: >vim
		  let v:errmsg = ""
		  silent! next
		  if v:errmsg != ""
		    " ... handle error
<

			*v:errors* *errors-variable* *assert-return*
v:errors
		Errors found by assert functions, such as |assert_true()|.
		This is a list of strings.
		The assert functions append an item when an assert fails.
		The return value indicates this: a one is returned if an item
		was added to v:errors, otherwise zero is returned.
		To remove old results make it empty: >vim
		  let v:errors = []
<
		If v:errors is set to anything but a list it is made an empty
		list by the assert function.

					*v:event* *event-variable*
v:event
		Dictionary of event data for the current |autocommand|.  Valid
		only during the event lifetime; storing or passing v:event is
		invalid!  Copy it instead: >vim
		  au TextYankPost * let g:foo = deepcopy(v:event)
<
		Keys vary by event; see the documentation for the specific
		event, e.g. |DirChanged| or |TextYankPost|.
		  KEY              DESCRIPTION ~
		  abort            Whether the event triggered during
		                   an aborting condition (e.g. |c_Esc| or
		                   |c_CTRL-C| for |CmdlineLeave|).
		  chan             |channel-id|
		  cmdlevel         Level of cmdline.
		  cmdtype          Type of cmdline, |cmdline-char|.
		  cwd              Current working directory.
		  inclusive        Motion is |inclusive|, else exclusive.
		  scope            Event-specific scope name.
		  operator         Current |operator|.  Also set for Ex
		  commands         (unlike |v:operator|). For
		                   example if |TextYankPost| is triggered
		                   by the |:yank| Ex command then
		                   `v:event.operator` is "y".
		  regcontents      Text stored in the register as a
		                   |readfile()|-style list of lines.
		  regname          Requested register (e.g "x" for "xyy)
		                   or the empty string for an unnamed
		                   operation.
		  regtype          Type of register as returned by
		                   |getregtype()|.
		  visual           Selection is visual (as opposed to,
		                   e.g., via motion).
		  completed_item   Current selected complete item on
		                   |CompleteChanged|, Is `{}` when no complete
		                   item selected.
		  height           Height of popup menu on |CompleteChanged|
		  width            Width of popup menu on |CompleteChanged|
		  row              Row count of popup menu on |CompleteChanged|,
		                   relative to screen.
		  col              Col count of popup menu on |CompleteChanged|,
		                   relative to screen.
		  size             Total number of completion items on
		                   |CompleteChanged|.
		  scrollbar        Is |v:true| if popup menu have scrollbar, or
		                   |v:false| if not.
		  changed_window   Is |v:true| if the event fired while
		                   changing window  (or tab) on |DirChanged|.
		  status           Job status or exit code, -1 means "unknown". |TermClose|
		  reason           Reason for completion being done. |CompleteDone|

				*v:exception* *exception-variable*
v:exception
		The value of the exception most recently caught and not
		finished.  See also |v:throwpoint| and |throw-variables|.
		Example: >vim
		  try
		    throw "oops"
		  catch /.*/
		    echo "caught " .. v:exception
		  endtry
<
		Output: "caught oops".

					*v:exiting* *exiting-variable*
v:exiting
		Exit code, or |v:null| before invoking the |VimLeavePre|
		and |VimLeave| autocmds.  See |:q|, |:x| and |:cquit|.
		Example: >vim
		  :au VimLeave * echo "Exit value is " .. v:exiting
<

					*v:false* *false-variable*
v:false
		Special value used to put "false" in JSON and msgpack.  See
		|json_encode()|.  This value is converted to "v:false" when used
		as a String (e.g. in |expr5| with string concatenation
		operator) and to zero when used as a Number (e.g. in |expr5|
		or |expr7| when used with numeric operators). Read-only.

				*v:fcs_choice* *fcs_choice-variable*
v:fcs_choice
		What should happen after a |FileChangedShell| event was
		triggered.  Can be used in an autocommand to tell Vim what to
		do with the affected buffer:
		  reload  Reload the buffer (does not work if
		          the file was deleted).
		  edit    Reload the buffer and detect the
		          values for options such as
		          'fileformat', 'fileencoding', 'binary'
		          (does not work if the file was
		          deleted).
		  ask     Ask the user what to do, as if there
		          was no autocommand.  Except that when
		          only the timestamp changed nothing
		          will happen.
		  <empty> Nothing, the autocommand should do
		          everything that needs to be done.
		The default is empty.  If another (invalid) value is used then
		Vim behaves like it is empty, there is no warning message.

				*v:fcs_reason* *fcs_reason-variable*
v:fcs_reason
		The reason why the |FileChangedShell| event was triggered.
		Can be used in an autocommand to decide what to do and/or what
		to set v:fcs_choice to.  Possible values:
		  deleted   file no longer exists
		  conflict  file contents, mode or timestamp was
		            changed and buffer is modified
		  changed   file contents has changed
		  mode      mode of file changed
		  time      only file timestamp changed

					*v:fname* *fname-variable*
v:fname
		When evaluating 'includeexpr': the file name that was
		detected.  Empty otherwise.

				*v:fname_diff* *fname_diff-variable*
v:fname_diff
		The name of the diff (patch) file.  Only valid while
		evaluating 'patchexpr'.

					*v:fname_in* *fname_in-variable*
v:fname_in
		The name of the input file.  Valid while evaluating:
		  option         used for ~
		  'charconvert'  file to be converted
		  'diffexpr'     original file
		  'patchexpr'    original file
		And set to the swap file name for |SwapExists|.

				*v:fname_new* *fname_new-variable*
v:fname_new
		The name of the new version of the file.  Only valid while
		evaluating 'diffexpr'.

				*v:fname_out* *fname_out-variable*
v:fname_out
		The name of the output file.  Only valid while
		evaluating:
		  option           used for ~
		  'charconvert'    resulting converted file [1]
		  'diffexpr'       output of diff
		  'patchexpr'      resulting patched file
		[1] When doing conversion for a write command (e.g., ":w
		file") it will be equal to v:fname_in.  When doing conversion
		for a read command (e.g., ":e file") it will be a temporary
		file and different from v:fname_in.

				*v:folddashes* *folddashes-variable*
v:folddashes
		Used for 'foldtext': dashes representing foldlevel of a closed
		fold.
		Read-only in the |sandbox|. |fold-foldtext|

					*v:foldend* *foldend-variable*
v:foldend
		Used for 'foldtext': last line of closed fold.
		Read-only in the |sandbox|. |fold-foldtext|

				*v:foldlevel* *foldlevel-variable*
v:foldlevel
		Used for 'foldtext': foldlevel of closed fold.
		Read-only in the |sandbox|. |fold-foldtext|

				*v:foldstart* *foldstart-variable*
v:foldstart
		Used for 'foldtext': first line of closed fold.
		Read-only in the |sandbox|. |fold-foldtext|

					*v:hlsearch* *hlsearch-variable*
v:hlsearch
		Variable that indicates whether search highlighting is on.
		Setting it makes sense only if 'hlsearch' is enabled. Setting
		this variable to zero acts like the |:nohlsearch| command,
		setting it to one acts like >vim
		  let &hlsearch = &hlsearch
<
		Note that the value is restored when returning from a
		function. |function-search-undo|.

				*v:insertmode* *insertmode-variable*
v:insertmode
		Used for the |InsertEnter| and |InsertChange| autocommand
		events.  Values:
		  i    Insert mode
		  r    Replace mode
		  v    Virtual Replace mode

						*v:key* *key-variable*
v:key
		Key of the current item of a |Dictionary|.  Only valid while
		evaluating the expression used with |map()| and |filter()|.
		Read-only.

						*v:lang* *lang-variable*
v:lang
		The current locale setting for messages of the runtime
		environment.  This allows Vim scripts to be aware of the
		current language.  Technical: it's the value of LC_MESSAGES.
		The value is system dependent.
		This variable can not be set directly, use the |:language|
		command.
		It can be different from |v:ctype| when messages are desired
		in a different language than what is used for character
		encoding.  See |multi-lang|.

					*v:lc_time* *lc_time-variable*
v:lc_time
		The current locale setting for time messages of the runtime
		environment.  This allows Vim scripts to be aware of the
		current language.  Technical: it's the value of LC_TIME.
		This variable can not be set directly, use the |:language|
		command.  See |multi-lang|.

						*v:lnum* *lnum-variable*
v:lnum
		Line number for the 'foldexpr' |fold-expr|, 'formatexpr',
		'indentexpr' and 'statuscolumn' expressions, tab page number
		for 'guitablabel' and 'guitabtooltip'.  Only valid while one of
		these expressions is being evaluated.  Read-only when in the
		|sandbox|.

						*v:lua* *lua-variable*
v:lua
		Prefix for calling Lua functions from expressions.
		See |v:lua-call| for more information.

					*v:maxcol* *maxcol-variable*
v:maxcol
		Maximum line length.  Depending on where it is used it can be
		screen columns, characters or bytes.  The value currently is
		2147483647 on all systems.

				*v:mouse_col* *mouse_col-variable*
v:mouse_col
		Column number for a mouse click obtained with |getchar()|.
		This is the screen column number, like with |virtcol()|.  The
		value is zero when there was no mouse button click.

				*v:mouse_lnum* *mouse_lnum-variable*
v:mouse_lnum
		Line number for a mouse click obtained with |getchar()|.
		This is the text line number, not the screen line number.  The
		value is zero when there was no mouse button click.

				*v:mouse_win* *mouse_win-variable*
v:mouse_win
		Window number for a mouse click obtained with |getchar()|.
		First window has number 1, like with |winnr()|.  The value is
		zero when there was no mouse button click.

				*v:mouse_winid* *mouse_winid-variable*
v:mouse_winid
		|window-ID| for a mouse click obtained with |getchar()|.
		The value is zero when there was no mouse button click.

			*v:msgpack_types* *msgpack_types-variable*
v:msgpack_types
		Dictionary containing msgpack types used by |msgpackparse()|
		and |msgpackdump()|. All types inside dictionary are fixed
		(not editable) empty lists. To check whether some list is one
		of msgpack types, use |is| operator.

						*v:null* *null-variable*
v:null
		Special value used to put "null" in JSON and NIL in msgpack.
		See |json_encode()|.  This value is converted to "v:null" when
		used as a String (e.g. in |expr5| with string concatenation
		operator) and to zero when used as a Number (e.g. in |expr5|
		or |expr7| when used with numeric operators). Read-only.
		In some places `v:null` can be used for a List, Dict, etc.
		that is not set.  That is slightly different than an empty
		List, Dict, etc.

				*v:numbermax* *numbermax-variable*
v:numbermax	Maximum value of a number.

				*v:numbermin* *numbermin-variable*
v:numbermin	Minimum value of a number (negative).

				*v:numbersize* *numbersize-variable*
v:numbersize
		Number of bits in a Number.  This is normally 64, but on some
		systems it may be 32.

					*v:oldfiles* *oldfiles-variable*
v:oldfiles
		List of file names that is loaded from the |shada| file on
		startup.  These are the files that Vim remembers marks for.
		The length of the List is limited by the ' argument of the
		'shada' option (default is 100).
		When the |shada| file is not used the List is empty.
		Also see |:oldfiles| and |c_#<|.
		The List can be modified, but this has no effect on what is
		stored in the |shada| file later.  If you use values other
		than String this will cause trouble.

					*v:operator* *operator-variable*
v:operator
		The last operator given in Normal mode.  This is a single
		character except for commands starting with <g> or <z>,
		in which case it is two characters.  Best used alongside
		|v:prevcount| and |v:register|.  Useful if you want to cancel
		Operator-pending mode and then use the operator, e.g.: >vim
		  :omap O <Esc>:call MyMotion(v:operator)<CR>
<
		The value remains set until another operator is entered, thus
		don't expect it to be empty.
		v:operator is not set for |:delete|, |:yank| or other Ex
		commands.
		Read-only.

			*v:option_command* *option_command-variable*
v:option_command
		Command used to set the option. Valid while executing an
		|OptionSet| autocommand.
		  value        option was set via ~
		  "setlocal"   |:setlocal| or `:let l:xxx`
		  "setglobal"  |:setglobal| or `:let g:xxx`
		  "set"        |:set| or |:let|
		  "modeline"   |modeline|

				*v:option_new* *option_new-variable*
v:option_new
		New value of the option. Valid while executing an |OptionSet|
		autocommand.

				*v:option_old* *option_old-variable*
v:option_old
		Old value of the option. Valid while executing an |OptionSet|
		autocommand. Depending on the command used for setting and the
		kind of option this is either the local old value or the
		global old value.

			*v:option_oldglobal* *option_oldglobal-variable*
v:option_oldglobal
		Old global value of the option. Valid while executing an
		|OptionSet| autocommand.

			*v:option_oldlocal* *option_oldlocal-variable*
v:option_oldlocal
		Old local value of the option. Valid while executing an
		|OptionSet| autocommand.

				*v:option_type* *option_type-variable*
v:option_type
		Scope of the set command. Valid while executing an
		|OptionSet| autocommand. Can be either "global" or "local"

				*v:prevcount* *prevcount-variable*
v:prevcount
		The count given for the last but one Normal mode command.
		This is the v:count value of the previous command.  Useful if
		you want to cancel Visual or Operator-pending mode and then
		use the count, e.g.: >vim
		  :vmap % <Esc>:call MyFilter(v:prevcount)<CR>
<
		Read-only.

				*v:profiling* *profiling-variable*
v:profiling
		Normally zero.  Set to one after using ":profile start".
		See |profiling|.

					*v:progname* *progname-variable*
v:progname
		The name by which Nvim was invoked (with path removed).
		Read-only.

					*v:progpath* *progpath-variable*
v:progpath
		Absolute path to the current running Nvim.
		Read-only.

					*v:register* *register-variable*
v:register
		The name of the register in effect for the current normal mode
		command (regardless of whether that command actually used a
		register).  Or for the currently executing normal mode mapping
		(use this in custom commands that take a register).
		If none is supplied it is the default register '"', unless
		'clipboard' contains "unnamed" or "unnamedplus", then it is
		"*" or '+'.
		Also see |getreg()| and |setreg()|

					*v:relnum* *relnum-variable*
v:relnum
		Relative line number for the 'statuscolumn' expression.
		Read-only.

				*v:scrollstart* *scrollstart-variable*
v:scrollstart
		String describing the script or function that caused the
		screen to scroll up.  It's only set when it is empty, thus the
		first reason is remembered.  It is set to "Unknown" for a
		typed command.
		This can be used to find out why your script causes the
		hit-enter prompt.

			*v:searchforward* *searchforward-variable*
v:searchforward
		Search direction:  1 after a forward search, 0 after a
		backward search.  It is reset to forward when directly setting
		the last search pattern, see |quote/|.
		Note that the value is restored when returning from a
		function. |function-search-undo|.
		Read-write.

				*v:servername* *servername-variable*
v:servername
		Primary listen-address of Nvim, the first item returned by
		|serverlist()|. Usually this is the named pipe created by Nvim
		at |startup| or given by |--listen| (or the deprecated
		|$NVIM_LISTEN_ADDRESS| env var).

		See also |serverstart()| |serverstop()|.
		Read-only.

		                                                     *$NVIM*
		$NVIM is set by |terminal| and |jobstart()|, and is thus
		a hint that the current environment is a subprocess of Nvim.
		Example: >vim
		  if $NVIM
		    echo nvim_get_chan_info(v:parent)
		  endif
<

		Note the contents of $NVIM may change in the future.

				*v:shell_error* *shell_error-variable*
v:shell_error
		Result of the last shell command.  When non-zero, the last
		shell command had an error.  When zero, there was no problem.
		This only works when the shell returns the error code to Vim.
		The value -1 is often used when the command could not be
		executed.  Read-only.
		Example: >vim
		  !mv foo bar
		  if v:shell_error
		    echo 'could not rename "foo" to "bar"!'
		  endif
<

				*v:statusmsg* *statusmsg-variable*
v:statusmsg
		Last given status message.
		Modifiable (can be set).

					*v:stderr* *stderr-variable*
v:stderr
		|channel-id| corresponding to stderr. The value is always 2;
		use this variable to make your code more descriptive.
		Unlike stdin and stdout (see |stdioopen()|), stderr is always
		open for writing. Example: >vim
		:call chansend(v:stderr, "error: toaster empty\n")
<

				*v:swapchoice* *swapchoice-variable*
v:swapchoice
		|SwapExists| autocommands can set this to the selected choice
		for handling an existing swapfile:
		  'o'    Open read-only
		  'e'    Edit anyway
		  'r'    Recover
		  'd'    Delete swapfile
		  'q'    Quit
		  'a'    Abort
		The value should be a single-character string.  An empty value
		results in the user being asked, as would happen when there is
		no SwapExists autocommand.  The default is empty.

				*v:swapcommand* *swapcommand-variable*
v:swapcommand
		Normal mode command to be executed after a file has been
		opened.  Can be used for a |SwapExists| autocommand to have
		another Vim open the file and jump to the right place.  For
		example, when jumping to a tag the value is ":tag tagname\r".
		For ":edit +cmd file" the value is ":cmd\r".

					*v:swapname* *swapname-variable*
v:swapname
		Name of the swapfile found.
		Only valid during |SwapExists| event.
		Read-only.

				*v:t_blob* *t_blob-variable* *v:t_TYPE*
v:t_blob	Value of |Blob| type.  Read-only.  See: |type()|

					*v:t_bool* *t_bool-variable*
v:t_bool	Value of |Boolean| type.  Read-only.  See: |type()|

					*v:t_dict* *t_dict-variable*
v:t_dict	Value of |Dictionary| type.  Read-only.  See: |type()|

					*v:t_float* *t_float-variable*
v:t_float	Value of |Float| type.  Read-only.  See: |type()|

					*v:t_func* *t_func-variable*
v:t_func	Value of |Funcref| type.  Read-only.  See: |type()|

					*v:t_list* *t_list-variable*
v:t_list	Value of |List| type.  Read-only.  See: |type()|

					*v:t_number* *t_number-variable*
v:t_number	Value of |Number| type.  Read-only.  See: |type()|

					*v:t_string* *t_string-variable*
v:t_string	Value of |String| type.  Read-only.  See: |type()|

				*v:termrequest* *termrequest-variable*
v:termrequest
		The value of the most recent OSC or DCS control sequence
		sent from a process running in the embedded |terminal|.
		This can be read in a |TermRequest| event handler to respond
		to queries from embedded applications.

				*v:termresponse* *termresponse-variable*
v:termresponse
		The value of the most recent OSC or DCS control sequence
		received by Nvim from the terminal. This can be read in a
		|TermResponse| event handler after querying the terminal using
		another escape sequence.

					*v:testing* *testing-variable*
v:testing	Must be set before using `test_garbagecollect_now()`.

				*v:this_session* *this_session-variable*
v:this_session
		Full filename of the last loaded or saved session file.
		Empty when no session file has been saved.  See |:mksession|.
		Modifiable (can be set).

				*v:throwpoint* *throwpoint-variable*
v:throwpoint
		The point where the exception most recently caught and not
		finished was thrown.  Not set when commands are typed.  See
		also |v:exception| and |throw-variables|.
		Example: >vim
		  try
		    throw "oops"
		  catch /.*/
		    echo "Exception from" v:throwpoint
		  endtry
<
		Output: "Exception from test.vim, line 2"

						*v:true* *true-variable*
v:true
		Special value used to put "true" in JSON and msgpack.  See
		|json_encode()|.  This value is converted to "v:true" when used
		as a String (e.g. in |expr5| with string concatenation
		operator) and to one when used as a Number (e.g. in |expr5| or
		|expr7| when used with numeric operators). Read-only.

						*v:val* *val-variable*
v:val
		Value of the current item of a |List| or |Dictionary|.  Only
		valid while evaluating the expression used with |map()| and
		|filter()|.  Read-only.

					*v:version* *version-variable*
v:version
		Vim version number: major version times 100 plus minor
		version.  Vim 5.0 is 500, Vim 5.1 is 501.
		Read-only.
		Use |has()| to check the Nvim (not Vim) version: >vim
		  :if has("nvim-0.2.1")
<

			*v:vim_did_enter* *vim_did_enter-variable*
v:vim_did_enter
		0 during startup, 1 just before |VimEnter|.
		Read-only.

					*v:virtnum* *virtnum-variable*
v:virtnum
		Virtual line number for the 'statuscolumn' expression.
		Negative when drawing the status column for virtual lines, zero
		when drawing an actual buffer line, and positive when drawing
		the wrapped part of a buffer line.
		Read-only.

				*v:warningmsg* *warningmsg-variable*
v:warningmsg
		Last given warning message.
		Modifiable (can be set).

					*v:windowid* *windowid-variable*
v:windowid
		Application-specific window "handle" which may be set by any
		attached UI. Defaults to zero.
		Note: For Nvim |windows| use |winnr()| or |win_getid()|, see
		|window-ID|.

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