Radix Sort: Irregular Subkeys
The subkeys for each phase do not have to have the same ranges.
To sort playing cards, we can let the less significant subkey be suit, and the more significant subkey be rank.
Clubs < Diamonds < Hearts < Spades
2 < 3 < 4 < 5 < 6 < 7 < 8 < 9 < 10 < J < Q < K < A