Include

I'm using DFSORT.

In this snippit, I'm looking at the include statement. Can you give some explanation on it?
``````SORT FIELDS=(53,5,CH,A)(50,2,CH,A)
OUTFIL FNAMES=USA,
TRAILER1=(/,20:'USA Areas 2009 Quarterly Budget Balance',/,
/,20:'Total Number of Areas:    ',8930,/,
/,10:'Quarter 1',30:'Quarter 2',50:'Quarter 3',70:'Quarter 4',
/,1:TOT=(53,5,PD,M12),TOT=(58,5,PD,M12),
TOT=(63,5,PD,M12),TOT=(68,5,PD,M12),/,
/,10:'Minimum',30:'Minimum',50:'Minimum',70:'Minimum',
/,9:MIN=(53,5,PD,M12),29:MIN=(58,5,PD,M12),
49:MIN=(63,5,PD,M12),69:MIN=(68,5,PD,M12),/,
/,10:'Maximum',30:'Maximum',50:'Maximum',70:'Maximum',
/,9:MAX=(53,5,PD,M12),29:MAX=(58,5,PD,M12),
49:MAX=(63,5,PD,M12),69:MAX=(68,5,PD,M12),/,
/,10:'Average',30:'Average',50:'Average',70:'Average',
/,9:AVG=(53,5,PD,M12),29:AVG=(58,5,PD,M12),
49:AVG=(63,5,PD,M12),69:AVG=(68,5,PD,M12),/)
OUTFIL FNAMES=VI1,
INCLUDE COND=(50,2,CH,EQ,C'AK',AND,53,1,CH,EQ,C'2'),
TRAILER1=(/,20:'Virgina Cities 2009 Quarterly Budget Balance',/,
``````
SOLUTION
woolmilkporc

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