Macbeth, Act IV, Scene I

Round about the cauldron go;
In the poison'd entrails throw.
Toad, that under cold stone
Days and nights has thirty-one
Swelter'd venom sleeping got,
Boil thou first I' the charmed pot.

Double, double toil and trouble;
Fire burn, and cauldron bubble.

Scale of dragon, tooth of wolf,
Witches, mummy, maw and gulf
Of the ravin'd salt-sea shark,
Root of hemlock digg'd I, the dark,
Liver of blaspheming Jew,
Gall of goat, and slips of yew
Silver'd in the moon's eclipse,
Nose of Turk and tartar's lips,
Finger of birth-strangled babe
Ditch-deliver'd by a drab'
Make the gruel thick and slab:
Add thereto a tiger's chaudron,
For the ingredients of our cauldron.

Double, double toil and trouble;
Fire burn, and cauldron bubble.

Cool it with a baboon's blood,
Then the charm is firm and good.


That looks like a great algorithm to make a witch's brew - but is it guaranteed to work as a magic spell?
What makes a "proper" algorithm?


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