text: rna_names = [
          'A',
          'G',
          'C',
          'U',
          'I'
  ]
  
  dna_names = [
          'DA',
          'DG',
          'DC',
          'DT',
          'DI'
  ]
  
  nucleotide_names = rna_names + dna_names
  
  
  