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  1. or download this
    $string1='--------NNNNNNN--------NNNNN--------NNNNN------NNNNNNN------
    +-------BBBBB-----';
    
  2. or download this
     
    $string1_new='--------NNNNNNN--------NNNNN--------NNNNN------NNNNNNNBB
    +BBBBBBBBBBBBBBBBBBBBB';
    
  3. or download this
    $string2='---------NNNNN-NNNNNNNNNNNNN----NNNNNNNNNNN---------BBBBBBBB
    +BB';
    
  4. or download this
    $string2_new='---------NNNNN-NNNNNNNNNNNNN----NNNNNNNNNNNBBBBBBBBBBBBB
    +BBBBBB';
    
  5. or download this
    $string3='-------NNNNNNN-----------------BBBBBBBBBBBBBBB-------------N
    +NNNNNN';
    
  6. or download this
    $string3_new='-------NNNNNNNBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
    +BBBNNNNNNN';
    
  7. or download this
    $string4='--------BBBBBBBBBBBB-------NNNNNNNNNNNNN------NNNNNN';
    
  8. or download this
    $string4_new='--------BBBBBBBBBBBBBBBBBBBNNNNNNNNNNNNN------NNNNNN';
    
  9. or download this
        $initial_protein=~s/B-/BB/g;
        $initial_protein=~s/-B/BB/g;