4 bit Adder and subrtacter fully functioning.

4bit_addsub_xor.ise
4bit_addsub_xor.restore
4bit_addsub_xor.vhd
4bit_addsub_xor_xdb
...................\cst.xbcd
...................\tmp
...................\...\ise
...................\...\...\version
...................\...\...\__OBJSTORE__
...................\...\...\............\Autonym
...................\...\...\............\common
...................\...\...\............\HierarchicalDesign
...................\...\...\............\..................\HDProject
...................\...\...\............\..................\.........\HDProject
...................\...\...\............\..................\.........\HDProject_StrTbl
...................\...\...\............\PnAutoRun
...................\...\...\............\.........\Scripts
...................\...\...\............\.........\.......\RunOnce_tcl
...................\...\...\............\.........\.......\RunOnce_tcl_StrTbl
...................\...\...\............\ProjectNavigator
...................\...\...\............\................\dpm_project_main
...................\...\...\............\................\................\dpm_project_main
...................\...\...\............\................\................\dpm_project_main_StrTbl
...................\...\...\............\................\................\NameMap
...................\...\...\............\................\................\NameMap_StrTbl
...................\...\...\............\................\__stored_objects__
...................\...\...\............\................\__stored_objects___StrTbl
...................\...\...\............\................\__stored_object_table__
...................\...\...\............\ProjectNavigatorGui
...................\...\...\............\...................\GuiProjectData
...................\...\...\............\...................\GuiProjectData_StrTbl
...................\...\...\............\SrcCtrl
...................\...\...\............\.......\SavedOptions
...................\...\...\............\STE
...................\...\...\............\_ProjRepoInternal_
...................\...\...\__REGISTRY__
...................\...\...\............\Autonym
...................\...\...\............\.......\regkeys
...................\...\...\............\bitgen
...................\...\...\............\......\regkeys
...................\...\...\............\common
...................\...\...\............\......\regkeys
...................\...\...\............\cpldfit
...................\...\...\............\.......\regkeys
...................\...\...\............\Cs
...................\...\...\............\..\regkeys
...................\...\...\............\dumpngdio
...................\...\...\............\.........\regkeys
...................\...\...\............\fuse
...................\...\...\............\....\regkeys
...................\...\...\............\HierarchicalDesign
...................\...\...\............\..................\HDProject
...................\...\...\............\..................\.........\regkeys
...................\...\...\............\..................\regkeys
...................\...\...\............\hprep6
...................\...\...\............\......\regkeys
...................\...\...\............\idem
...................\...\...\............\....\regkeys
...................\...\...\............\map
...................\...\...\............\...\regkeys
...................\...\...\............\netgen
...................\...\...\............\......\regkeys
...................\...\...\............\ngc2edif
...................\...\...\............\........\regkeys
...................\...\...\............\ngcbuild
...................\...\...\............\........\regkeys
...................\...\...\............\ngdbuild
...................\...\...\............\........\regkeys
...................\...\...\............\par
...................\...\...\............\...\regkeys
...................\...\...\............\ProjectNavigator
...................\...\...\............\................\regkeys
...................\...\...\..

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