The OR bitwise operation takes two sets of bits and for each pair of bits (the two bits at the same index in each set) returns 1 if either of the bits are 1. Otherwise, it returns 0.
Think of it like a bucket with two holes in it. If both holes are closed, no water comes out. If either hole is open, or if both are open, water comes out.
When performing OR on two integers, all digit columns used by either of the integers remain:
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