?? introduce "frame" concept ... ???in part for understanding coset partition as just special case of "coarsening partition" of forgetful projection from richer to poorer features ... ?????.... this partly as motivation for me to get to 4-elt set example ... ??? .... catalog of all feature types ... ???...
??maybe bit about history / etymology of "group" here ... ??? ...
?? idea that conjugation amounts to "straightforward action on graph of permutation" ... ?? but / and also ... ??demonstration via ... "string diagram" and "replacing both input and output symbols ... " ... ??? ....
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