Try this and let us know the results.
I assume you will not have Admin/Auth twice for a same Key.
Also if you have admin,Auth and user or etc this program will generate Admin and Auth alone in the output excluding user.
//CPYJK EXEC PGM=ICETOOL
//TOOLMSG DD SYSOUT=*
//SYSOUT DD SYSOUT=*
//DFSMSG DD SYSOUT=*
//IN1 DD *
20006 ADMIN
20007 USER
20008 CUSTOMER
20006 AUTH
20009 ADMIN
//OUT2 DD SYSOUT=*
//TOOLIN DD *
SELECT FROM(IN1) TO(OUT2) ON(1,5,CH) ALLDUPS USING(CNT1)
/*
//CNT1CNTL DD *
INCLUDE COND=(7,5,CH,EQ,C'ADMIN',OR,7,4,CH,EQ,C'AUTH')
Thanks
Magesh