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Q 1511323220.     `A * B` means `A` is the sister of `B`
`A $ B` means `B` is the mother of `A`
`A + B` means `A` is the brother of `B`
`A = B` means `B` is the father of `A`.
Which of the following means M is the maternal uncle of `N`?
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)