If you have an Ace and a deuce in you hand and there is an Ace or deuce on the board, you hand is counterfeited if there are not four low cards. Since you must use two cards from your hand you will need to have three different low cards on the board or your hand will not count as low.

Example:
You have A-2
The board is:
2 4 5 J Q
You make can’t a low hand because the 2 is paired.