collapseos/blk/434

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