[Haskell-beginners] Looking for a data structure

[Levi Stephen]

Hi,
I'm looking for how best to represent selections from a set of items.

For example, consider a soccer/football type game.

You would have a Player data type. The game would store a player pool of all
players in that game. Each club will have a number of players from that
player pool, each match will involve that club selecting a number of players
from its list of players.

What is the best way to structure this data and hopefully at the type level
enforce this subset type relationship?

Thanks,
Levi
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