(=> (Competitor ?Competitor)
(Or (Exists (?Vendor2) (Competitor-Of ?Competitor ?Vendor2))
(Exists (?Vendor1) (Competitor-Of ?Vendor1 ?Competitor))))
(<=> (Competitor ?Competitor)
(And (Vendor ?Competitor)
(Qua-Entity ?Competitor)
(Or (Exists (?Vendor2)
(Competitor-Of ?Competitor ?Vendor2))
(Exists (?Vendor1)
(Competitor-Of ?Vendor1 ?Competitor)))))