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if (not B) {
   A 
...
      undef
   }
}

(not B and A)
or
...
   or
   (not (E and F) and undef)
))

(not B and A) or (B and E and F and C and D)

For convertion to single expressions:
if (A) { B } else { C } === (A and B) or (not A and C)
...
For simplification:
X and undef === undef
X or undef  === X