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We have the following indirect implication of form equivalence classes:

216 \(\Rightarrow\) 216 given by the following sequence of implications, with a reference to its direct proof:

Implication	Reference
216 \(\Rightarrow\) 216

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

Howard-Rubin Number	Statement
216:	Every infinite tree has either an infinite chain or an infinite antichain.
216:	Every infinite tree has either an infinite chain or an infinite antichain.

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