(defun hello (&optional name) "Say hello, optionally to NAME." (let ((greetee (or name "World"))) (concat "Hello, " greetee "!")))
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Implement basic list operations.
Calculate the number of grains of wheat on a chessboard given that the number on each square doubles.
Convert a trinary number, represented as a string (e.g. '102012'), to its decimal equivalent using first principles.
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