Ranking Top N but excluding ties at Nth position

Hi,

I have a requirement where I need to do top N analysis report. I came across problem where we have ties at Nth position, my client want not to show any Nth value because that will be misleading and if there are 3 value at Nth place then what to remove. what he want is to exclude Nth values and show only until N -1th place.

Show top 5 from following list:

A 100

B  75

C 50

D 25

E 5

F 5

G 5

H 4

I 3

Webi Rank function will give following:

A 100

B  75

C 50

D 25

E 5

F 5

G 5

What I want is way to get following:

A 100

B  75

C 50

D 25

Any thought ?

Thanks in Advance

Kumar