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223445 BG2A093.x1    51    7     51    4    75    96    0 1    0    44
223446 BG2A073.x1    51    7     51    4    43    95    0 1    0    44
...
223449 BG2A045.x1    51    7     51    4    47    95    1 1    0    47
223501 BG2A034.x1    51    7     51    4    47    95    0 1    0    46
223442 BG2A021.x1    51    7     51    4    48    96    0 1    0    45

223445 BG2A093.x1    51    7     51    4 1    75    96    0 1    0    
+44
223446 BG2A073.x1    51    7     51    4 2    75    95    0 1    0   4
+3 
...
223449 BG2A045.x1    51    7     51    4 1    47    95    1 1    0    
+47
223501 BG2A034.x1    51    7     51    4 2    47    95    0 1    0    
+46
223442 BG2A021.x1    51    7     51    4 1    48    96    0 1    0    
+45

#!/usr/local/bin/perl -w 
my $pre_ref_pos_b;
...

  }
}