RE: [External] : Continue cycling from a particular element in collection

[Drew Adams]

> I am using 'completing-read' with INITIAL-INPUT to prefill the minibuffer
> with the first entry "alpha".  Hew can I then start at index k from collection
> as the next entry.

There is NO "next entry".  INITIAL-INPUT is simply a string that gets inserted 
in the minibuffer.  It need not correspond to any candidate provided by 
argument COLLECTION, meaning that it need not correspond to any completion.

`completing-read' can be LAX, meaning that, if REQUIRE-MATCH is nil or absent 
then it accepts any text you input - it need not be a completion candidate.