Playlist(s) - removing an entry, general maintenance

Pasted below is the play list display. Numbers start at 40 (667 of 712 tracks). Must be some missing between 40 and 712 because subtracting 40 from 712 yields 45, not 40. I have no idea how to find just where there are gaps, I’m not going to count the entries one by one to find them (grin). With dups selected it finds none (i’ve deleted all the dups). If there is something else I can check please tell me and I’ll do so.