mask! shortening
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jamesbowman commented
Lines 17 to 18 in 6c56439
can be:
>r over xor r> and xor ;
demonstration:
: x rot over invert and rot rot and or ; ok
: y >r over xor r> and xor ; ok
aaaa bbbb 0f0f x . ABAB ok
aaaa bbbb 0f0f y . ABAB ok