## Comments

    ;; (foo bar)

## Strings

    (foo "bar")

### With nested symbols

    (foo "A string with a `symbol ")

### With nested arguments

    (foo "A string with an ARGUMENT ")

## Quoted symbols

    (foo #'bar)

## Lisp properties

    (foo :bar)

## Splices

    (foo ,bar ,@bar)

## Keywords

    (let foo (bar arg))

## Declarations

    (declare foo)

## Booleans

    (foo t)

    (foo nil)

## Numbers

    (foo 1)

    (foo -1.5)

## Definitions

    (defvar bar 23)

    (defcustom bar 23)

## Function definitions

    (defun multiply-by-seven (number)
           "Multiply NUMBER by seven."
           (* 7 number))

## Lambda expressions

    (lambda (number) (* 7 number))