Kassadin vs Ahri

So i just got raped especially in the early game by ahri as kassadin.... I have been playing a lot of kassadin lately and i manage to get like 80% farm in early game while staying safe and roaming because his early is really bad... But against ahri had no chance she just zoned me hard and i tried farming with my q and e under tower but... And im relatively good at avoiding her charm but when i got hit i barely managed to get away if at all. So how the hell do i lane against ahri as kassasdin?
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