Just had a thought. In their second post, Puneet (finally) explained that the data can be in any order, so obviously does need the SORT anyway.
The interesting thing is then, how to get the MINimum beginning range if it is not on the first record? Does it work coding the MIN for 6,10?
I assume you are defaulting to OPTION EQUALS at your site for it to work in your test with the data from Puneet's first?