A - 5 Low Hand Ranking

Introduction
An A - 5 low hand is ranked taking the lowest 5 unique cards. Paired cards are discarded. A 5 card low hand beats any 4 card low hand. Flushes and straights are ignored. Hands are ranked taking the highest card first and if this matches, then take the next lowest cards and comparing those and so on.

Nuts. The best possible low hand is a wheel, an ace to five straight.