Table for the 3 triples with object "21.6" sorted by label

Subject	Predicate
mdb:matroos: Olson, Christian (uit Fredrikstad (N))	mdb:maandgage
mdb:matroos: Sietzes, Jan Jans	mdb:maandgage
mdb:matroos: Venema, W.G.	mdb:maandgage