Karnaugh map x1 x1' ----------------- solution x1'x3 + x1'x2 + x1'x4' + x1x2'x4 | | 1 | 1 | 1 | x4 ----------------- x3 | | | 1 | 1 | ----------------- x4' | | | 1 | 1 | x3'----------------- | | 1 | | 1 | x4 ----------------- x2 x2' x2 x1 x1' ----------------- | | 1 | x | x | x4 Term x1'x3 selected ----------------- x3 | | | x | x | ----------------- x4' | | | 1 | 1 | x3'----------------- | | 1 | | 1 | x4 ----------------- x2 x2' x2 x1 x1' ----------------- | | 1 | 1 | 1 | x4 Term x1'x4' selected ----------------- x3 | | | x | x | ----------------- x4' | | | x | x | x3'----------------- | | 1 | | 1 | x4 ----------------- x2 x2' x2 x1 x1' ----------------- | | 1 | 1 | x | x4 Term x1'x2 selected ----------------- x3 | | | 1 | x | ----------------- x4' | | | 1 | x | x3'----------------- | | 1 | | x | x4 ----------------- x2 x2' x2 x1 x1' ----------------- | | x | 1 | 1 | x4 Term x1x2'x4 selected ----------------- x3 | | | 1 | 1 | ----------------- x4' | | | 1 | 1 | x3'----------------- | | x | | 1 | x4 ----------------- x2 x2' x2