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The K-Map for a boolean function is shown below.The number of essential prime implicants for this function is ?

1 1 0 1
0 0 0 1
1 0 0 0
1 0 0 1

The answer given is 3. But I think it will be 4 - (0,8,10,2) , (0,1) , (3,6) and (8,12) 

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