Digital Electronics
An exclusive NOR gate is logically equivalent to

 X-OR gate followed by an inverter
 inverter followed by an X-OR gate
 NOT gate followed by a NOR gate
 complement of a NOR gate

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Digital Electronics
In K-map simplification, a group of four adjacent 1s leads to a term with

 three literals less than the total number of variables
 one literal less than the total number of variables
 two literals less than the total number of variables
 four literals less than the total number of variables

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