We have the following indirect implication of form equivalence classes:
			
| Implication | Reference | 
|---|---|
| 80 \(\Rightarrow\) 80 | 
							 	On the principle of dependent choices, Mostowski,  A. 1948, Fund. Math.  | 
					
Here are the links and statements of the form equivalence classes referenced above:
| Howard-Rubin Number | Statement | 
|---|---|
| 80: | \(C(\aleph_{0},2)\): Every denumerable set of pairs has a choice function.  | 
					
| 80: | \(C(\aleph_{0},2)\): Every denumerable set of pairs has a choice function.  | 
					
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