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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Digital Electronics
A PROM

 is mask programmed
 can be programmed only once
 is erasable by ultraviolet light
 can be programmed any number of times

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