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This mechanism has been proposed for the formation of ethylbenzene: 1: CH3Ch2Br + AlBr3 → AlBr4- + CH3CH2+ 2: CH3CH2+ + C6H6 → C6H6CH2CH3+ 3: C6H6CH2CH3+ + AlB4- → AlBr3 + HBr + C6H5CH2CH3 Which substance serves as the catalyst?