Digital Electronics
The NAND-NAND realization is equivalent to

 OR-AND realization
 AND-OR realization
 NOT-OR realization
 AND-NOT realization

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Digital Electronics
In case of OR gate, no matter what the number of inputs, a

1 at any input causes the output to be at logic 0
0 at any input causes the output to be at logic 1.
0 any input causes the output to be at logic 0
1 at any input causes the output to be at logic 1

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