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A Lisp expression that you can evaluate is called a "form".
Evaluating a form always produces a result, which is a Lisp object. In
the examples in this manual, this is indicated with `=>':
(car '(1 2))
You can read this as "`(car '(1 2))' evaluates to 1".
When a form is a macro call, it expands into a new form for Lisp to
evaluate. We show the result of the expansion with `==>'. We may or
may not show the actual result of the evaluation of the expanded form.
(third '(a b c))
==> (car (cdr (cdr '(a b c))))
Sometimes to help describe one form we show another form which
produces identical results. The exact equivalence of two forms is
indicated with `=='.
(make-sparse-keymap) == (list 'keymap)
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