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There where 3 men each with only one arm living together. One day they get a knock on the door, it was the post man with a large parcel...

Upon opening this parcel they fnd it has a fresh human arm in it.

They take this arm to the garden, dig a large hole and bury it.

Upon returning to the house they smile and say thank you...

The answer I am looking for is who are the men, for what reson dd they get the arm, and wy did they do what they di upon receiving it.