I think the programmers made them purposely as difficult for players to use as possible. About every one of them contains many 0's and 1's, or are they O's and I's... I haven't a clue. But keep requesting a new one that you know what the characters are and you hit your friend finder limit. This is rediculous, 0's and 1's and O's and I's should not be used in such codes or if they are a font should be used that easily distinguishes between them that anyone will know what they are.