'Z + Y' means 'Y is the son of Z'.
'Z $ Y' means 'Y is the father of Z'.
'Y % Z' means 'Y is the son-in-law of Z'.
'Z - Y' means 'Y is the wife of Z'.
'Y * Z' means 'Z is the brother of Y'.
'Y # Z' means 'Z is the only sister of Y'.
Which two symbols can sequentially replace the question marks (?) in the following expression to show that ‘D is the wife of W’?
W % O - B ? C ? D
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