312. Two common verb stems, θῡ- (sacrifice) and λῡ- (loose), have -ῡ- in the present, future, and σα-aorist, elsewhere υ.
θῡ́ω, θῡ́σω, ἔθῡσα, τέθυκα, τέθυμαι, ἐτύθην (§ 47.c).
A few others are irregular or variable. (See, in the Verb-list, ἀνύω, δῡ́ω, τίω.)
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