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collapseos/blk/434
2020-05-03 20:36:35 -04:00

10 lines
194 B
Plaintext

: MOVE ( a1 a2 u -- )
( u ) 0 DO
SWAP DUP I + C@ ( a2 a1 x )
ROT SWAP OVER I + ( a1 a2 x a2 )
C! ( a1 a2 )
LOOP
2DROP
;
: PREV 3 - DUP @ - ;