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