Table for the 4 triples with object "1977-04-20" sorted by label

Subject	Predicate
pm-bb:1977	ns1:P82a_begin_of_the_begin
pm-bb:1977	ns1:P82b_end_of_the_end
?:a89b9d10-daca-11ee-a972-aa665a4ad156	ns1:P82a_begin_of_the_begin
?:a89b9d10-daca-11ee-a972-aa665a4ad156	ns1:P82b_end_of_the_end