Private Sub Worksheet_Change(ByVal Target As Range)
Dim c As Range
With Range("F4:F" & Cells.SpecialCells(xlCellTypeLastCell).Row)
If Intersect(Target, Cells) Is Nothing Then Exit Sub
Application.ScreenUpdating = False
.Columns(-2).Resize(, 3).Font.Strikethrough = False 'RAZ
For Each c In .Cells
If LCase(c) = "oui" Then c(1, -2).Resize(, 3).Font.Strikethrough = True
Next
End With
End Sub