figForth Word - BACK
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BACK addr --
Calculate the backward branch offset from HERE to addr and compile it
into the next available dictionary memory address
xcvxcvcv
CFA: 007345 3C28 BACK: DW DOCOL ; :
PFA: 007347 0769 DW HERE ; HERE
007349 4B69 DW SUBB ; -
00734B 2369 DW COMMA ; '
00734D 1725 DW SEMIS ; ;