Bonjour,
une proposition via macro
Sub aargh()
Dim dl&, i&, j&
dl = Cells(Rows.Count, 1).End(xlUp).Row 'dernière ligne
Range("A1").Resize(dl, 2).Sort key1:=Range("A1"), order1:=xlAscending, Header:=xlNo 'tri sur colonne 1
For i = 1 To dl - 1
For j = i + 1 To dl
If Cells(i, 1) = Cells(j, 1) Then
k = k + 1
Cells(k, 5) = Cells(i, 2) & " " & Cells(i, 1) & " " & Cells(j, 2) 'affiche la combinaison
Else
Exit For
End If
Next j
Next i
End Sub