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We have the following indirect implication of form equivalence classes:

231 \(\Rightarrow\) 32 given by the following sequence of implications, with a reference to its direct proof:

Implication	Reference
231 \(\Rightarrow\) 32	clear

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

Howard-Rubin Number	Statement
231:	\(UT(WO,WO,WO)\): The union of a well ordered collection of well orderable sets is well orderable.
32:	\(C(\aleph_0,\le\aleph_0)\): Every denumerable set of non-empty countable sets  has a choice function.

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