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We have the following indirect implication of form equivalence classes:

421 \(\Rightarrow\) 421 given by the following sequence of implications, with a reference to its direct proof:

Implication	Reference
421 \(\Rightarrow\) 421

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

Howard-Rubin Number	Statement
421:	\(UT(\aleph_0,WO,WO)\): The union of a denumerable set of well orderable sets can be well ordered.
421:	\(UT(\aleph_0,WO,WO)\): The union of a denumerable set of well orderable sets can be well ordered.

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