..."digital" LOGIC really helps to define/explain the difference between OR and AND (ha,ha)!
0 = 0 AND 0
0 = 0 AND 1
0 = 1 AND 0
1 = 1 AND 1 <---only TRUE or VALID output
0 = 0 OR 0 <---only non-TRUE or non-VALID output
1 = 0 OR 1
1 = 1 OR 0
1 = 1 OR 1
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