?subgrel page contains an interesting error example with a very short syllable c. It looks more interesting with other syllables,

subgrel({y=[a,b,averylongsyllable]}, 
    grelgroup({a,b}, {[a,a], [b,a]}));

Error, (in subgrel) generator [a, b, averylongsyllable] 
contains a syllable `averylongsyllable' that is not a generator, 
or the inverse of a generator, of the parent group

Alec


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