Replace Same Value Within Non-Contiguous Ranges With Different Values

This time I want to replace:
number "99" in range("B:C") to number "1";
number "99" in range("E:F") to number "2";
number "99" in range("H:I") to number "3";

Sub Replacing()
Dim rRange As Range
Dim lArea As Long
Dim Co As Byte
Dim NaCo As Byte
NaCo = 99
Set rRange = Range("B:C,E:F,H:I")
With rRange
For lArea = 1 To .Areas.Count
With .Areas(lArea)
Co = Choose(lArea, 1, 2, 3)
.Replace What:=Co, Replacement:=NaCo, LookAt:=xlWhole, _
SearchOrder:=xlByRows, MatchCase:=False, SearchFormat:=False, _
ReplaceFormat:=False
End With
Next lArea
End With
End Sub