I think the getting the sequence correct - yes or no - is only part of what's interesting. Of course someone could have 3 songs correct, but then shift the sequence by 4th song first when it should've been further up. In that case, the person would be wrong about 1 song, but correct about the BR relationship between the others.
The sequence would still be wrong so that sort of correctness is of course not shown in my little summary up there (yet). I might have to fix that.
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