Sigma KB Term Intersection

No TPTP formula. May not be expressible in strict first order.	Sports.kif 1040-1047	If a corpuscular object is an instance of ski and the corpuscular object is made of a kind of substance, then a kind of substance is a subclass of metal or the kind of substance is a subclass of wood or the kind of substance is a subclass of plastic
No TPTP formula. May not be expressible in strict first order.	Mid-level-ontology.kif 9195-9195	Plastic is a subclass of hydrocarbon
No TPTP formula. May not be expressible in strict first order.	Mid-level-ontology.kif 4601-4601	Synthetic wicker is a subclass of plastic
No TPTP formula. May not be expressible in strict first order.	Mid-level-ontology.kif 9202-9202	Polypropylene is a subclass of plastic
No TPTP formula. May not be expressible in strict first order.	Mid-level-ontology.kif 9209-9209	Polystyrene is a subclass of plastic