Some machines just seem to be pickier than others. I heard a story
somewhere that there is something about 2006 series bills that causes
some acceptors not to take them. Since then, if I have a machine that
takes a lot of bills, but mysteriously rejects a crisp one, it seems
like it's almost always a 2006 one. But I'm not obsessively keeping
records on this sort of thing :-) so it could be selective memory;
draw your own conclusions...
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