Coach Krishnan is trying to put together a team of four players for a tennis tournament. He has seven players available: males – Arkinso, Barlo and Charles, and females – Monika, Nandini, Omni and Pikasoni. All players are of equal ability. There must be at least two males on the team and all players must be able to play with each other.

•    Barlo cannot play with Monika.

•    Charles cannot play with Pkasoni.

•    Monika cannot play with Omni.

If Monika is on the team, what other players must be on the team as well?