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We have the following indirect implication of form equivalence classes:

88 \(\Rightarrow\) 64 given by the following sequence of implications, with a reference to its direct proof:

Implication	Reference
88 \(\Rightarrow\) 64	Classes of Dedekind finite cardinals, Truss, J. K. 1974a, Fund. Math.

Here are the links and statements of the form equivalence classes referenced above:

Howard-Rubin Number	Statement
88:	\(C(\infty ,2)\):  Every family of pairs has a choice function.
64:	\(E(I,Ia)\) There are no amorphous sets. (Equivalently, every infinite set is the union of two disjoint infinite sets.)

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