Question: What nickname refers to the African American Tom Johnson?
Choices:
Ye
College Boy
El Loco
Country
Туманный Альбион
Keystone State
Med City
United
Λεπροί
Captain Marvel
Answer: College Boy
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:name> "Tom Johnson" . ?e <ethnic_group> ?e_1 . ?e_1 <pred:name> "African Americans" .  ?e <nickname> ?pv .  }
Program:
function: Find
inputs: African Americans
function: Relate
dependencies: 0
inputs: ethnic group
backward
function: Find
inputs: Tom Johnson
function: And
dependencies: 1
2
function: QueryAttr
dependencies: 3
inputs: nickname