Question: Is the Amazon author page of the producer of Selma, which casted Oprah Winfrey,  B000APVLWQ ?
Choices:
yes
no
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
Answer: no
SPARQL: ASK { ?e <pred:instance_of> ?c . ?c <pred:name> "human" . ?e_1 <producer> ?e . ?e_1 <pred:name> "Selma" . ?e_1 <cast_member> ?e_2 . ?e_2 <pred:name> "Oprah Winfrey" .  ?e <Amazon_author_page> ?pv . ?pv <pred:value> "B000APVLWQ" .  }
Program:
function: Find
inputs: Oprah Winfrey
function: Relate
dependencies: 0
inputs: cast member
backward
function: Find
inputs: Selma
function: And
dependencies: 1
2
function: Relate
dependencies: 3
inputs: producer
forward
function: FilterConcept
dependencies: 4
inputs: human
function: QueryAttr
dependencies: 5
inputs: Amazon author page
function: VerifyStr
dependencies: 6
inputs: B000APVLWQ