Table for the 4 triples with object "2a" on predicate ns1:opus sorted by label

Subject	Predicate
?:3 Sonatas	ns1:opus
?:"For Piano, No. 1"	ns1:opus
?:"For Violin (or Flute) and Piano" in G major	ns1:opus
?:"For Violin (or Flute), Violoncello, and Piano" in B-flat major	ns1:opus