john-users - avoid duplicates with rules

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Date: Fri, 19 Mar 2010 19:57:31 +0100
From: "websiteaccess@...il.com" <websiteaccess@...il.com>
To: john-users@...ts.openwall.com
Subject: avoid duplicates with rules

Hi

 NOTE : For easier understanding, my example has only 2 words in 
wordlist.

 I have in my wordlist  2 words :
 justine
 justone

and 1 rule in my john.conf

 $1

the result is :
justine1
justone1

now I add a second rule, my john.conf is now 

$1
/i si[aeouy]$[0-9]

 As you can see,  the 2 differents rules will generate 2 times the same 
word
 $1 
 justine1
 justone1

 /i si[aeouy]$[0-9] 
 justine1

I want keep both rules, how can I avoid duplicate words ?
There is a special command in JTR's rule to avoid duplicates, but i'm 
not very comfortable with these.

Thanks 

 W.A.