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We have the following indirect implication of form equivalence classes:

88 \(\Rightarrow\) 80 given by the following sequence of implications, with a reference to its direct proof:

Implication	Reference
88 \(\Rightarrow\) 80	clear

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.
80:	\(C(\aleph_{0},2)\):  Every denumerable set of  pairs has  a  choice function.

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