Macro not identifying all overlaps between dates

Challenge is to identify all the "overlaps" between the policies in Col E taken out against the same loan in Col B.

Attached Macro works perfectly where there is an overlap between consecutive rows, but I can't work out how to make it "see" the overlaps that may be on a non-consecutive row, and map that overlap.

E.g. Rows 10 - 12 show loan 193672 has been covered by Policies 9, 10 and 11. The Macro identifies the overlap between Policies 9 and 10, and between 10 and 11, but "misses" that there is still an overlap between Policies 9 and 11 after Policy 10 expires.

Option Explicit

Sub OVERLAPS()

Dim f As Long, n As Long

f = Cells(Rows.Count, 2).End(xlUp).Row

For n = 3 To f

'Check for overlaps
    If Range("B" & n) = Range("B" & n - 1) Then
        If Range("F" & n) < Range("G" & n - 1) Then
            If Range("G" & n) < Range("G" & n - 1) Then
            Range("H" & n) = Range("F" & n) & "- " & Range("G" & n)
            Else: Range("H" & n) = Range("F" & n) & "- " & Range("G" & n - 1)
            End If
        End If
    End If
    
    Next
    
End Sub

Cols M - AB demonstrate the overlaps that should be captured.

Hope it's clear, and all suggestions, pointers and solutions welcome as ever.

Ochimus