"s ⇌ tī / X*[a-e-i-m-n-o-r-u-y-ā-ē-ī-ō-ū][-spread -LAB -labdent -low]_" . . . "s ⇌ tī / X*[a-e-i-m-n-o-r-u-y-ā-ē-ī-ō-ū][-spread -LAB -labdent -low]_" . .