Was M1 founded by M2 , founded by M3 , M4 , M5 , and M6 , and founded by a person
SELECT count(*) WHERE {
?x0 a ns:people.person .
M1 ns:organization.organization.founders ?x0 .
M1 ns:organization.organization.founders M2 .
M1 ns:organization.organization.founders M3 .
M1 ns:organization.organization.founders M4 .
M1 ns:organization.organization.founders M5 .
M1 ns:organization.organization.founders M6
}