Eye of newt, and toe of frog, 
Wool of bat, and tongue of dog, 
Adder's fork, and blind-worm's sting, 
Lizard's leg, and owlet's wing,— 
For a charm of powerful trouble, 
Like a hell-broth boil and bubble. 
Double, double toil and trouble; 
Fire burn, and caldron bubble.
 — William Shakespeare
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