<zzo38> slashlearn cricket//Cricket is one team is in and one team is out, and the team who are out try to get the team who is in to be out, and then the team who was previously out can be in. Whoever earn more points wins, unless you run out of time, in which case nobody wins.

The bicyclic monoid is the free monoid generated by two wheels of a bicycle, quotiented by the restriction that the bicycle itself is equal to the identity.