Nested string substitutions

[Lulu of the Lotus-Eaters]

Antonio Cuni <TOGLIMIcuni at programmazione.it> wrote previously:
|First, we should use a better data structure for our job:
|subs = { 'foo': ['bar', 'baz'],
|         'bar': ['kat', 'www'],
|         'baz': [],
|         'kat': [],
|         'www': [] }

Unfortunately, this is the same wrong impression I conveyed to Holger
Krekel.  I need to do a string substitution, not an item substitution.
The things that get replaced need not be space-separated.

It's not clear to me how you would translate from this solution into one
that didn't rely on easy division of the candidate substitution tokens.
Fortunately, I like Meyer's function well enough.

Yours, Lulu...

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