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191.52user 153.47system 5:49.44elapsed 98%CPU
open SEQ, '<', $ARGV[0] or die $!; #plain open MASK, '<', $ARGV[1] or die $!; #hardmask ... close SEQ; close MASK;
0.45user 0.07system 0:05.59elapsed 9%CPU
#Seq_name #Seq_len 2-micron 6318 ... VII 1090946 XV 1091289 IV 1531918