Propositions – This is where letters are assigned to options.
eg. Let (p, q or r) denote (chosen option)
Contrapositive – This is where all the options are turned from positive to negative or vice versa
eg. If p = p, then q =q
Contra = If not p = not p, then not q = not q
Converse – This is where you swap the two options
eg. If p = q then q = r
Conver = If q = r then p = q