Question: Was the date of first performance not in 1993 for the play whose lyrics are written by Christopher Hampton?
Choices: yes
no
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
SPARQL: ASK { ?e <pred:instance_of> ?c . ?c <pred:name> "play" . ?e <lyrics_by> ?e_1 . ?e_1 <pred:name> "Christopher Hampton" .  ?e <date_of_first_performance> ?pv . ?pv <pred:year> ?v . FILTER ( ?v != 1993 ) .  }
Program:
function: Find
inputs: Christopher Hampton
function: Relate
dependencies: 0
inputs: lyrics by
backward
function: FilterConcept
dependencies: 1
inputs: play
function: QueryAttr
dependencies: 2
inputs: date of first performance
function: VerifyYear
dependencies: 3
inputs: 1993
!=
Answer: no