Table for the 4 triples with object Free on predicate ns1:performer sorted by label

Subject	Predicate
?:Performance 1241 in 201 Piccadilly, Studio 1	ns1:performer
?:Performance 1242 in Playhouse Theatre, Northumberland Avenue	ns1:performer
?:Performance 1243 in Playhouse Theatre, Northumberland Avenue	ns1:performer
?:Performance 1244 in Unknown	ns1:performer