Select from set of elements

Say you want to select a certain set of candidates, for instance, candidates 1, 5, 7, 13 and 20.
Rather than:

if (cand = 1 or cand = 5 or cand = 7 or cand = 13 or cand = 20)

you can use:

if cand in (1, 5, 7, 13, 20)