Question: (a) Write out the incidence matrix for the cubical digraph and identify the basis of its cokernel with the circuits. (b) Find three circuits which

(a) Write out the incidence matrix for the cubical digraph and identify the basis of its cokernel with the circuits.
(b) Find three circuits which do not correspond to any of your basis elements, and express them as a linear combination of the basis circuit vectors.

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