Republican Norm Coleman's lawyers have convinced the three-judge panel in the Senate election trial to let them present evidence that more than 5,200 absentee ballots should be counted because they were wrongly rejected. In doing so, they argue that local elections officials' mistakes can be divided into 16 categories.
Al Franken's lawyers are expected to present a pile of rejected absentee ballots that they think should be counted. It's not known how they will organize them. Here are samples of ballots in each of the Coleman lawyers' categories, with a link to an example in the category.

Category A-1: Not counted even though the local election official actually marked the ballot "accepted." 321 ballots

Category A-2: Rejected though they were not marked as "rejected." 168 ballots

Category B: Rejected for no apparent reason, with the local election official failing to offer, in the lawyers' words, "any comprehensible reason." 163 ballots

Category C-1: Rejected for lacking a signature when a pre-printed sticker placed on the ballot envelope obstructed the signature requirement. 857 ballots

Category C-2: Rejected because election official sent voter the wrong ballot. 18 ballots

Category D-1: Rejected because the election official couldn't find the voter's original application for an absentee ballot. 199 ballots