>>932
Sub Macro1()
  rr = Cells(Rows.Count, 1).End(xlUp).Row
  For i = 1 To rr
    n = Cells(i, 1)
    s = Cells(i, 2)
    t = s & "・"
    For j = 1 To i - 1
      If Cells(j, 1) = n Then
        w = Cells(j, 2)
        If InStr(t, w) = 0 Then
          t = t & w & "・"
        End If
      End If
    Next
    t = t & s & "・"
    For j = i + 1 To rr
      If Cells(j, 1) = n Then
        w = Cells(j, 2)
        If InStr(t, w) = 0 Then
          t = t & w & "・"
        End If
      End If
    Next
    t = Left(t, Len(t) - 1)
    t = Right(t, Len(t) - 1 - Len(s))
    Cells(i, 3) = t
  Next
End Sub