Array examples

> (setf arr (make-array '(2 3) :initial-element nil))

#2A((NIL NIL NIL) (NIL NIL NIL))

> (aref arr 0 0)

NIL

> (setf (aref arr 0 0) 'b)

B

> (aref arr 0 0)

B

> arr

#2A((B NIL NIL) (NIL NIL NIL))

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