Let A be the set of all statement forms in the three variables p, q, and r, and let R be the relation defined on A as follows: For all S and T in A,  S R T  ⇔  S and T have the same truth table.   What are the distinct equivalence classes of R?   Thus, there are ________  distinct equivalence classes.

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A: Introduction A set can be defined as a collection of elements.

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