Check prove (A B), (A C), (B D) therefore (C D) TRUE

AB
AC
BD
CD

Truth check table

CaseABCDABACBDCD
1TTTTTTTT
2TTTFTTFT
3TTFTTFTT
4TTFFTFFF
5TFTTTTTT
6TFTFTTTT
7TFFTTFTT
8TFFFTFTF
9FTTTTTTT
10FTTFTTFT
11FTFTTTTT
12FTFFTTFF
13FFTTFTTT
14FFTFFTTT
15FFFTFTTT
16FFFFFTTF
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