1、Do you want heads or tails, Sue?
2、Can you guess, heads or tails?
3、heads or tails; top or bottom of a coin
4、Let's flip a coin to decide who should go first - do you want heads or tails?
5、Moreover, the explanatory prose is haphazard (and not infrequently wrong or incoherent — for example, I cannot make heads or tails of the lead-in to the very first example, prime.py).
