Sub test()
ligne = 2
For n = 1 To 6
For i = 2 To Sheets("CLIENTS" & n).Range("B65536").End(xlUp).Row
z1 = Application.WorksheetFunction.CountIf(Sheets("CLIENTS1").Range("B2:B" & Sheets("CLIENTS1").Range("B65536").End(xlUp).Row), Sheets("CLIENTS" & n).Range("B" & i))
z2 = Application.WorksheetFunction.CountIf(Sheets("CLIENTS2").Range("B2:B" & Sheets("CLIENTS2").Range("B65536").End(xlUp).Row), Sheets("CLIENTS" & n).Range("B" & i))
z3 = Application.WorksheetFunction.CountIf(Sheets("CLIENTS3").Range("B2:B" & Sheets("CLIENTS3").Range("B65536").End(xlUp).Row), Sheets("CLIENTS" & n).Range("B" & i))
z4 = Application.WorksheetFunction.CountIf(Sheets("CLIENTS4").Range("B2:B" & Sheets("CLIENTS4").Range("B65536").End(xlUp).Row), Sheets("CLIENTS" & n).Range("B" & i))
z5 = Application.WorksheetFunction.CountIf(Sheets("CLIENTS5").Range("B2:B" & Sheets("CLIENTS5").Range("B65536").End(xlUp).Row), Sheets("CLIENTS" & n).Range("B" & i))
z6 = Application.WorksheetFunction.CountIf(Sheets("CLIENTS6").Range("B2:B" & Sheets("CLIENTS6").Range("B65536").End(xlUp).Row), Sheets("CLIENTS" & n).Range("B" & i))
If z1 + z2 + z3 + z4 + z5 + z6 > 1 Then
Sheets("recap doublons unités 1 et 2").Range("A" & ligne) = Sheets("CLIENTS" & n).Range("A" & i)
Sheets("recap doublons unités 1 et 2").Range("B" & ligne) = Sheets("CLIENTS" & n).Range("B" & i)
Sheets("recap doublons unités 1 et 2").Range("C" & ligne) = Sheets("CLIENTS" & n).Range("C" & i)
Sheets("recap doublons unités 1 et 2").Range("D" & ligne) = Sheets("CLIENTS" & n).Name
ligne = ligne + 1
End If
Next i