We may ask in general which Coxeter groups arise as subgroups of a given Coxeter group. This question is of course far too general. However, there are Coxeter groups which arise canonically as subgroups of a given Coxeter group.

Moreover nature's liberal hand decketh many of the sea cliffs with wild hyssop, sage, pellamountain, marjoram, rosemary, and suchlike well-savouring herbs.

The bacne regimen is identical to the regular regimen with the addition of an 8-10% glycolic acid (alpha hydroxy) lotion. - Acne.org

I do not think the Constitution should go into working détails or hairsplits that may be necessary when some of the various rights which it defines are rationalized out to their ultimate extrêmes.