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collapseos/blk/434
2020-04-25 21:54:07 -04:00

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( a1 a2 u -- )
: MOVE
( u ) 0 DO
SWAP DUP I + C@ ( a2 a1 x )
ROT SWAP OVER I + ( a1 a2 x a2 )
C! ( a1 a2 )
LOOP
2DROP
;
: DELW 1- 0 SWAP C! ;
: PREV
3 - DUP @ ( a o )
- ( a-o )
;