ANS Forth for logical not is 0=, not invert. Replace wrong usage.
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@ -45,8 +45,8 @@ decimal 32 constant bl
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\ ** CORE EXT
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0 constant false
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-1 constant true
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: <> = invert ;
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: 0<> 0= invert ;
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: <> = 0= ;
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: 0<> 0= 0= ;
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: compile, , ;
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: erase ( addr u -- ) 0 fill ;
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: nip ( y x -- x ) swap drop ;
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