How to get the terms within 5 words of another term?

[Sven <sv...@gmail.com>]

Hi everyone,

I have a term "foo" and I want to count all the occurrences of all the 
terms that are within 5 words of "foo" in all the documents which 
contain "foo".  For simplicity sake, this is only for a single field.  
So if I have 3 documents (each with a single field) that look like this:

Once upon a time, foo lived far, far away in a magical kingdom.

"The Life and Time of the Hero Called Foo" is, by far, the best novel 
about spam I have ever read.

I theorize that over time, foo will gradually move far away from bar.

I would like to generate a list of terms and hits based on their 
proximity to "foo" in all the documents.  So I'll end up with something 
like:

far : 4
time : 3
away : 2

Any help would be greatly appreciated.

Thanks much!
-Sven


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