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/usr/share/X11/bindings/sun is in libmotif-common 2.3.4-6+deb8u1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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!
!
! $Id: sun,v 1.2 2002/01/05 15:20:42 jimk Exp $
!
! "Sun Microsystems, Inc."
osfActivate	:		<Key>KP_Enter
osfCancel	:		<Key>Escape
osfHelp		:		<Key>Help,<Key>F1
osfMenu		:Shift		<Key>F10
osfMenuBar	:		<Key>F10

osfLeft		:		<Key>Left
osfUp		:		<Key>Up
osfRight	:		<Key>Right
osfDown		:		<Key>Down

osfBeginLine	:		<Key>Home
osfEndLine	:		<Key>End

osfPageUp	:		<Key>Prior
osfPageDown	:		<Key>Next

osfBackSpace	:		<Key>BackSpace
osfDelete	:		<Key>Delete
osfInsert	:		<Key>Insert
osfUndo		:		<Key>Undo
osfAddMode	:Shift		<Key>F8
osfCopy		:		<Key>SunCopy
osfCut		:		<Key>SunCut
osfPaste	:		<Key>SunPaste