I have a table....theres a surprise

month protocol port  utime
06      tcp        21   100002
06      tcp        21   100003
05      udp       43   100232
05      udp       21   100245

what I would like to do  is select by month and by protocol but within 
protocol limit to the top 5 by count of port.

 In other words,I want  the 5 most common instances of port per instance of 
protocol per instance of month.

is  this actually possible with a single query  (mysql 4.0)?

I have tried vairious combinations of group by and order by but however I do 
it, limit n, seems to do just that...limit the results to n rows... 


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