claim: Levoamphetamine changes concentration.
evidence: Duach mac Dallan , 6th king of Ui Maine , fl .. Ui Maine. Ui Maine. 5th-century / 6th-century .. John O'Donovan remarked that `` Dallan , who was also a brother of Fiachra Finn , was prince of Hy-Maine for eleven years , when he was mortally wounded and afterwards drowned . ''. John O'Donovan. John O'Donovan ( scholar )