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Look at the K-Map below :

Prime Implicant : the biggest subcube that should not be completely covered by any other subcube (some may be covered)

 EPI - It should cover at least one element that is not a part of any other subcube.

Looking at the diagram, it is quite easy to say that $EPI = 2$ (red colored subcubes)

And $PI = 6$ $(2 EPI + AB + C'DA' + CDB' + A'B'D)$ --  two circles indicate a PI.

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