Parsing lujvo

[seidensticker@msn.com]

I'm having a problem parsing lujvo.  Here's an example that will 
illustrate the issue.  Take the lujvo "boltipkeipre."  The "kei" is a 
rafsi for both "kei" (terminator) and "kelci" (play).  The lujvo 
should work out to ball+kick+play+person (presumably 'ball player' 
or 'soccer player'), but my program happens upon the wrong 
interpretation of kei.

My question is: what's the rule to disambiguate kei in this case?  
They're both in the gismu list, so perhaps the rule is: "when there 
are two gismu that match, take the 5-letter one."

Is this correct?