As a carpenter went home after closing from his workshop, a black, poisonous cobra entered his workshop.
The cobra was hungry and hoped to find its supper lurking somewhere within. It slithered from one end to another and accidentally bumped into a double-edged metal axe and got slightly injured.
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In anger and seeking revenge, the snake bit the axe with full force. What could a bite do to a metallic axe? Instead the cobra's mouth started bleeding.