Assertion: ballet | /r/HasProperty | based on pushkin's story
Facets:
value: to the royal opera house board
type: TRANSITIVE-OBJECT
value: in the 1960s
type: TEMPORAL
Source sentences:
text: He first proposed a ballet based on Pushkin's story to the Royal Opera House board in the 1960s, but it was turned down, and he pursued the idea when he moved to Stuttgart.