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Table 3. Truth Table

A
B
C
D
AB
CD
AB+CD
0
0
0
0
0
0
0
0
0
1
0
0
1
0
0
1
0
0
1
0
0
0
1
1
0
1
1
0
1
0
0
1
0
0
1
1
0
1
1
0
1
1
1
1
0
1
1
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
1
0
0
1
0
0
1
0
0
1
0
0
0
1
1
0
1
1
0
1
0
0
1
0
0
1
1
0
1
1
0
1
1
1
1
0
1
1
0
1
1
1
1
1
1
1
1
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