• D-erythrose, D-threose, L-erythrose, L-threose
  • L-erythrose, L-threose, L-erythrose, D-threose
  • D-threose, D-erythrose, L-threose, L-erythrose
  • L-erythrose, L-threose, D-erythrose, D-threose
  • Explanation:

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