The verb-stem may also show modifications in quantity, as present λύ_-ω
N.—Various causes produce this variation. λύ_ω has υ_ from analogy to λύ_-σω, ἔ-λυ_-σα where the verb-stem λυ has been regularly lengthened ( cross534, cross543). For Attic φθάνω
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].