a b c d a∨c a∨c∨d ¬b a∨c∨d∨¬b
0 0 0 0 0 0 1 1
0 0 0 1 0 1 1 1
0 0 1 0 1 1 1 1
0 0 1 1 1 1 1 1
0 1 0 0 0 0 0 0
0 1 0 1 0 1 0 1
0 1 1 0 1 1 0 1
0 1 1 1 1 1 0 1
1 0 0 0 1 1 1 1
1 0 0 1 1 1 1 1
1 0 1 0 1 1 1 1
1 0 1 1 1 1 1 1
1 1 0 0 1 1 0 1
1 1 0 1 1 1 0 1
1 1 1 0 1 1 0 1
1 1 1 1 1 1 0 1