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R u le 40 . (1) E le m e ntar y p r ogram s for th e ed u ca ble m e nta lly im p a ir ed s ha ll se r ve n otm or e than 15 d iffe r e nt s tu de nt s . Wh e n an ele m e ntar y p r ogram for th e ed u ca ble m e nta llyim p a ir ed ha s 12 or m or e s tu de nt s in th e r oom at on e t im e, an a ide s ha ll be a ss ign ed t o th ep r ogram .