which grade level has a typical age (minimum) less than 13?
Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity
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Kindergarten Preschool Fifth grade Pre-kindergarten Fourth grade Third grade Second grade First grade Sixth grade Seventh grade Junior Kindergarten Senior Kindergarten Big section Primary 3 Grade Primary Voortgezet onderwijs onderbouw Middle course level 1 Year Seven Pre-Junior Kindergarten Year 1 Primary 5 Year 6 Year Seven Groep 2 Year Five Year One Kindergarten Secondary Year 1 Preparatory Sixth Elementary Year 4 Year Six Year Three Grade 8 Primary 6 Elementary course level 1 Secondary 2 Year Four Year Two Preparatory course Elementary Year 2 Year Four Primary 7 Groep 4 Primary 2 Year Three Little section Fifth Groep 3 Primary 1 Year 3 Reception Year 5 Elementary Year 6 Primary 4 Middle section Year Eight Elementary Year 3 Year Six Elementary course level 2 Year Five Secondary 1 Year 4 Year One Year Two Elementary Year 1 Middle course level 2 Elementary Year 5 Year 7 Groep 1
class literal
education.grade_level 13^^http://www.w3.org/2001/XMLSchema#integer
education.grade_level type.int
Grade level 13
none <
education.grade_level.typical_age_minimum
Typical age (minimum)
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX : <http://rdf.freebase.com/ns/> 
SELECT (?x0 AS ?value) WHERE {
SELECT DISTINCT ?x0  WHERE { 
?x0 :type.object.type :education.grade_level . 
FILTER (?x1 < "13"^^<http://www.w3.org/2001/XMLSchema#integer>)
?x0 :education.grade_level.typical_age_minimum ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND education.grade_level (lt education.grade_level.typical_age_minimum 13^^http://www.w3.org/2001/XMLSchema#integer))