"[e-o-ē-ō]_ ⇌ [i-u-ī-ū]_is / X*[-spread -nas -labdent][-spread -labdent -low]_[n-r]_" . . . "[e-o-ē-ō]_ ⇌ [i-u-ī-ū]_is / X*[-spread -nas -labdent][-spread -labdent -low]_[n-r]_" . .