"_s ⇌ er_m / X*[-spread -labdent][b-c-d-g-k-l-m-n-p-q-r-s-t-z]_u_" . . . "_s ⇌ er_m / X*[-spread -labdent][b-c-d-g-k-l-m-n-p-q-r-s-t-z]_u_" . .