Was a Canadian person influenced by M1 and M2 and influenced by M3
SELECT count(*) WHERE {
?x0 a ns:people.person .
?x0 ns:influence.influence_node.influenced_by M1 .
?x0 ns:influence.influence_node.influenced_by M2 .
?x0 ns:influence.influence_node.influenced_by M3 .
?x0 ns:people.person.nationality ns:m.0d060g
}