OverB.hs:7:15: error:
    Conflicting family instance declarations:
      C [Int] [a] = CListList2 -- Defined at OverB.hs:7:15
      C [a] [Int] = C9ListList -- Defined at OverC.hs:7:15

OverB.hs:9:15: error:
    Conflicting family instance declarations:
      OverA.D [Int] [a] = Int -- Defined at OverB.hs:9:15
      OverA.D [a] [Int] = Char -- Defined at OverC.hs:9:15