Digital Electronics
The terms which cannot be combined further in the tabular method are called

 essential prime implicants
 selective prime implicants
 implicants
 prime implicants

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

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

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