> perl llil2d.pl big1.txt big2.txt big3.txt long1.txt long2.txt long3.txt >perl2.tmp llil2d start get_properties : 11 secs sort + output : 23 secs total : 34 secs > llil2a big1.txt big2.txt big3.txt long1.txt long2.txt long3.txt >cpp2.tmp llil2 start get_properties : 6 secs sort + output : 5 secs total : 11 secs > diff cpp2.tmp perl2.tmp