xor2 - Two-input XOR (exclusive OR) gate
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 loadrt xor2 [count=N|names=name1[,name2...]]  | 
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 xor2.N  | 
xor2.N.in0
bit in 
xor2.N.in1 bit in 
xor2.N.out bit out
out is computed from the
value of in0 and in1 according to the
following rule: 
in0=TRUE in1=FALSE 
in0=FALSE in1=TRUE
out=TRUE
Otherwise,
out=FALSE
GPL