if (a1=1 or a2=2) and (a3=3) then a4=4 otherwise a4=0
But the original post could just as well be interpreted as:
if a1=1 or (a2=2 and a3=3) then a4=4 otherwise a4=0
As an example, if a1=1, a2=2 and a3=0, these two interpretations give
different results (the first gives a4=0 and the second gives a4=4).
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