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file1 is common_modify.vhd which has following lines of codes 
    sum_1_SUM0_0 : XOR3
...
      port map(PAD => a, Y => a_c);
    sum_1_CO0_i : MAJ3
      port map(A => a_c, B => c_c, C => b_c, Y => N_5);

file2 is nets.txt which has following lines of codes 
a_c
b_c
c_c

file3 is enabled_nets.txt which has following lines of codes 
a_e
b_e
c_e

open (IN1, "<common_modify.vhd") or die;
open (IN2, "<nets.txt") or die;
...
$enabled_nets[$i]\,/);
    }
}

sum_1_SUM0_0 : XOR3
      port map(A => b_e, B => a_e, C => c_e, Y => sum_c);
...
      port map(PAD => a, Y => a_c);
    sum_1_CO0_i : MAJ3
      port map(A => a_e, B => c_e, C => b_e, Y => N_5);