Did M1 and M3 influence M2 , influence a person , and marry a person
SELECT count(*) WHERE {
?x0 a ns:people.person .
?x1 a ns:people.person .
FILTER ( M1 != ?x1 ) .
FILTER ( M3 != ?x1 ) .
M1 ns:influence.influence_node.influenced ?x0 .
M1 ns:influence.influence_node.influenced M2 .
M1 ns:people.person.spouse_s/ns:people.marriage.spouse|ns:fictional_universe.fictional_character.married_to/ns:fictional_universe.marriage_of_fictional_characters.spouses ?x1 .
M3 ns:influence.influence_node.influenced ?x0 .
M3 ns:influence.influence_node.influenced M2 .
M3 ns:people.person.spouse_s/ns:people.marriage.spouse|ns:fictional_universe.fictional_character.married_to/ns:fictional_universe.marriage_of_fictional_characters.spouses ?x1
}