During our lessons on base 5, we talked quite a bit about "minimal collection." Apparently, the concept has stuck...
Yesterday, my 8yo ds walks up to me and says, "In Sleeping Queens, the minimal collection to get 50 is two 15s and one 20."
In the game you have to get 50 points and can get it by collecting various groups of cards. And, yes indeedy, the least number of cards you need to get 50 points is by the set of cards he mentioned. :)
I'm amused. Not minimally. ;)