"i_iscē_r ⇌ e__m / [a-e]?[b-d-m-n]_[b-d-m-n-p-t]_tu_" . . . "i_iscē_r ⇌ e__m / [a-e]?[b-d-m-n]_[b-d-m-n-p-t]_tu_" . .