Question: Leon Trotsky was actively involved in which war?
Choices: 2011 Libyan Civil War
Six-Day War
Russian Civil War
Yom Kippur War
American Civil War
Spanish Civil War
Chinese Civil War
Indo-Pakistani War of 1971
Second Crusade
Lebanese Civil War
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "war" . ?e <participant> ?e_1 . ?e_1 <pred:name> "Leon Trotsky" .   }
Program:
function: Find
inputs: Leon Trotsky
function: Relate
dependencies: 0
inputs: participant
backward
function: FilterConcept
dependencies: 1
inputs: war
function: What
dependencies: 2
Answer: Russian Civil War