Several general classes of rules, which might otherwise all be treated
separately, are included as special cases of the 
rule; these
are totalistic rules whose submenu is invoked by t, the even-odd
rules (a variant of semitotalism) accessible via m, and the
reversible rules. The former have been endowed with all the options of
the general menu which make sense (shifts are inappropriate, for
example), so that trials can be performed without shifting menus.