fact: Definition tallyStandardSubset {n : nat} (P : DecidableSubtype (⟦ n ⟧)) : ⟦ S n ⟧.
imports: UniMath.MoreFoundations.Tactics UniMath.MoreFoundations.DecidablePropositions UniMath.MoreFoundations.NegativePropositions UniMath.Combinatorics.StandardFiniteSets UniMath.MoreFoundations.Subtypes