My roommate is guilty of two of the seven deadly sins gluttony and sloth. Where can a colon be added to this sentence?

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My roommate is guilty: of two of the seven deadly sins gluttony and sloth.

My roommate is guilty of two of the seven deadly sins: gluttony and sloth.

My roommate is guilty of two of the seven: deadly sins gluttony and sloth.

You cannot add a colon to this sentence as it is constructed.