  GHZ paradoxes are presented for all even numbers of qubits from four up. They
are obtained from proofs of the Kochen-Specker (KS) theorem by showing how the
assumption of noncontextuality can be justified on the basis of locality. The
nature of the entangled states involved in our paradoxes is discussed. Some
multiqubit proofs of the KS theorem are also presented in the form of diagrams
from which they are visually obvious. The implications of our results are
discussed.
