I would like advice: the database contains a number of duplicate sequences. Example: %I A019505 %S A019505 4,22,27,58,85,94,121,166,202,265,274,319,346,355,378,382,391,438 %N A019505 Same as A006753. %O A019505 1,1 %K A019505 dead Should I remove these completely, and recycle the A numbers? Or leave them in place in case someone somewhere has a link to them? NJAS