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We have the following indirect implication of form equivalence classes:

232 \(\Rightarrow\) 173 given by the following sequence of implications, with a reference to its direct proof:

Implication	Reference
232 \(\Rightarrow\) 173	Paracompactness of metric spaces and the axiom of choice, Howard, P. 2000a, Math. Logic Quart.

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

Howard-Rubin Number	Statement
232:	Every metric space \((X,d)\) has a \(\sigma\)-point finite base.
173:	\(MPL\): Metric spaces are para-Lindelöf.

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