Question: What economic branch is operated by both Southwest Airlines and American Airlines?
Choices: retail
nursing
Athletic Club
Boeing 737
rail transport
Jack Nitzsche
62nd Golden Globe Awards
glucose
insurance
video game industry
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "economic branch" . ?e <operator> ?e_1 . ?e_1 <pred:name> "Southwest Airlines" .  ?e_2 <item_operated> ?e . ?e_2 <pred:name> "American Airlines" .  }
Program:
function: Find
inputs: Southwest Airlines
function: Relate
dependencies: 0
inputs: operator
backward
function: FilterConcept
dependencies: 1
inputs: economic branch
function: Find
inputs: American Airlines
function: Relate
dependencies: 3
inputs: item operated
forward
function: FilterConcept
dependencies: 4
inputs: economic branch
function: And
dependencies: 2
5
function: What
dependencies: 6
Answer: Boeing 737