"r_ī ⇌ _sum / [-spread -lat -labdent]*[c-g-k-q-u-ū][e-i-o-u]_r_" . . . "r_ī ⇌ _sum / [-spread -lat -labdent]*[c-g-k-q-u-ū][e-i-o-u]_r_" . .