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This link potentially matches multiple versions of "Reef Shark":

• Reef Shark (System Reference Document 5.2)

  CR 1/2 · Beast (Medium)

• Reef Shark (System Reference Document 5.1)

  CR 1/2 · Beast (Medium)

• Reef Shark (Monstrous Menagerie)

  CR 1/2 · Beast (Medium)