Question: How many mechanical waves were established after 1920?
Choices: 135
136
137
138
139
140
141
142
143
144
SPARQL: SELECT (COUNT(DISTINCT ?e) AS ?count) WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "mechanical wave" . ?e <inception> ?pv . ?pv <pred:year> ?v . FILTER ( ?v > 1920 ) .  }
Program:
function: FindAll
function: FilterYear
dependencies: 0
inputs: inception
1920
>
function: FilterConcept
dependencies: 1
inputs: mechanical wave
function: Count
dependencies: 2
Answer: 142