<commit_before>class DNA
  THYMIDINE = 'T'
  URACIL = 'U'

  attr_reader :strand
  def initialize(strand)
    @strand = strand
  end

  def to_rna
    strand.tr THYMIDINE, URACIL
  end
end
<commit_msg>Simplify ruby:rna-transcription<commit_after>class DNA < String
  THYMIDINE = 'T'
  URACIL = 'U'

  def to_rna
    tr THYMIDINE, URACIL
  end
end

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