Do paper first against a man. After the first round:
If you lost the last round, do whatever would have
won that round – winners often repeat themselves.
If you won the last round, the other person is likely to do
whatever comes next in the name from what they did last:
rock>paper / paper>scissors / scissors>rock.
Also, people don’t usually do the same thing 3 times in a row,
so if they did the same thing for the first two rounds, they
will probably use the next one in the cycle for the third.
(Statistically, it helps to shut your eyes when playing.)