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It is pointed out that the 60 complex rays in four dimensions associated witha system of two qubits yield over 10^9 critical parity proofs of theKochen-Specker theorem. The geometrical properties of the rays are described,an overview of the parity proofs contained in them is given, and examples ofsome of the proofs are exhibited.

Parity proofs of the Kochen-Specker theorem based on 60 complex rays in four dimensions