Let C = {n ∈ Z | n = 6r-5, n ∈ Z}  and D = {m ∈ Z | m = 3s +1} Prove or disprove each of the following statements. a) C ⊆ D b) D ⊆ C I am having difficulty in the proper way to 'write' this proof.  What goes where?  What steps go where?  How is this supposed to 'flow'?  Any help would be GREATLY appreciated.

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