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Go forward to Gate-map-testing operator (GATEDBY)
Masking operator (MASKEDBY)
LOOPIF <list-expr> MASKEDBY <16-bit mask-value or bitmask-set-name> ...
LOOPIF...MASKEDBY is true for words in the list where
all the bits set in the 16-bit mask
or a gate in <bitmask-set-name>
are present in the word being tested.
For the latter case the gate number passed is placed in the
reserved word GATE.
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