[kiwidude]

@drMerry - it is sorted out, provided you work through resolving the groups in order. As a book can only appear highlighted in one group at a time. If you display one group at a time there is no issue.

EDIT: I should add - this is where mucking around with the sort order such as by # of duplicates may cause a user more problems than it is worth.

In the example above, groups A and B of (1,2) and (1,3) will appear next to each other in the gui. So at least as a user you can see all three books displayed next to each other, even though only the first group is highlighted of the first two rows. So you have a chance of anticipating the three way merge and effectively resolving two groups at the same time.

If instead the groups are sorted by the more arbitrary # of duplicates, this may not be the case. I'll be honest and say I would never use # of duplicates as a criteria to sort by - to me what is important is to get genuine duplicates resolved, the # in the group of there being 2 or 10 makes no difference to me. So my inclination is to not offer it as an option (given the subtle issues like I mention above) unless someone provides a compelling reason why it would be valuable.