Good morning Ixion - perhaps you've got it by now? If not, think of Schubert's U????????? Symphony - another word for it.
I didn't know that there were two of the themed works by that particular author, either.
Thanks AJT - got there eventually - the first two works I found had an "OO" and "LL" respectively which made me think I was removing the "doublers" and put me slightly off track.