Question: Provide a proof for the opposite inclusion in Theorem 7.1. Theorem 7.1 Let A, B, C, and D be sets with R1 A

Provide a proof for the opposite inclusion in Theorem 7.1.
Theorem 7.1
Let A, B, C, and D be sets with R1 ⊆ A × B, R2 ⊆ B × C, and R3 ⊆ C × D. Then R1 o (R2 o R3) = (R1 o R2) o R3.

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