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If that's the case, then my option is valid. Because the chance of a tenfold repetition of an existing spell is too small. Although I would hedge my bets up to 100 or 1000 regenerations, depending on performance, just to minimize the absurd case where, after 6 misses, there is NO automatic hit due to repetitions. Since such a situation is perceived as a bug (if the player knows about the automatic hit after 6 misses), its chance must be minimized.
Added 14 hours 0 minutes ago
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FIX Fahim. Now, at least 1 spell will be learned every 5 levels.