In my opinion, the most difficult task for convert Chained Set to User-Owned Indexed Set is calculate exactly how many blocks the indexed set must contain.
David Matthews DBA at DHL then offered a Culprit and some sample output with the comment: oh, hang on, we can do better ............ end-objective:
Range Members % < 1 3,878 5% < 10 68,044 86% < 25 4,102 5% < 50 1,444 2% < 100 669 1% > 100 857 1% TOTAL 78,994 100%
The Culprit however got a bit "mangled" - you could not <cut>+<paste> into an editor on the mainframe and successfully run it - so the Culprit has been "repaired" and is attached to this post. I hope that this is useful to anybody who may be interested in determining Owner:Member distribution of number of members in a named SET - the output is sweet - works exactly as advertised - with a "Hatlo hat tip" to thank David for his code ...
Cheers - GaryC