• 1 · Religion and Magic
• 2 · Nature
• 3 · Human Being, Man in General
• 4 · Society, Civilization, Culture
• 5 · Abstract Ideas and Concepts
• 6 · History
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• 9 · Classical Mythology and Ancient History

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• 9 · Classical Mythology and Ancient History
• 94 · the Greek heroic legends (I)
• 94L · (story of) Hercules (Heracles)
• 94L3 · most important deeds of Hercules: the Twelve Labours
• 94L32 · the Twelve Labours: first series

94L322 · (2) the Hydra of Lerna is killed by Hercules

• 94L3221 · the Hydra is killed by Hercules assisted by Iolaus, who sears the roots of the severed heads with burning brands; an enormous crab nips Hercules' foot
• 94L322(+0) · (2) the Hydra of Lerna is killed by Hercules (+ variant)