22. Two boys Bobby, Benny and two girls Grace, Gloria are to be seated in a row according to the rule that a boy will not sit next to another boy and a girl will not sit next to another girl. Find the number of the combination(s) satisfying the above condition. 兩名男孩波比、賓利和兩名女孩麗思、歌莉亞就坐一排座位,並滿足「男孩

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