A.XBXBXb, XbXb; XBXbY; XbY.
B.XBXBXB, XBXbXb; XBY; XbY.
C.XBXb; XbXb; XBYY; XbYY.
D.XBXBXb; XbXb; XBXBY; XbY.

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