Index Sorting - Single Word

[Karen Robbins]

Hi Framers,

I've studied the index sort order reference page but don't quite get 
how to make my index sort a single word followed by its comma and 
page number above the same word with another word following it. I 
want to keep letter-by-letter sorting. If Frame ignores commas, and 
the entry has nothing following the single word, shouldn't it appear 
before an entry that has any character after the word? I know I could 
make another index level; but keeping known phrases together, without 
twisting them around or breaking them up, is better for my readers.

What I get:

URSA
    enrollment appointment times, 28
    enrollment, 22

What I want:

URSA
    enrollment, 22
    enrollment appointment times, 28

Any way to accomplish this?

Thanks,

Karen