I recently checked the glyphs preceding the respective “e,” “ee,” and “eee.” I no longer have the test, though. From memory: Before a single “e,” “ch” and ‘sh’ appear about 63 percent of the time; before “ee,” the gallow symbols also appears about 63 percent of the time. With three “e”s (“eee”), the variation is only slight. In Currier B, this effect is slightly stronger than in A.
In that respect, one shouldn’t merge these structures
In that respect, one shouldn’t merge these structures

