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While definitions are not expressions, compound expressions and definitions exhibit similar syntactic structure:
(define x 23) (* x 2)
While the first line contains a definition, and the second an
expression, this distinction depends on the bindings for let and
*. At the purely syntactical level, both are forms, and
form is the general name for a syntactic part of a Scheme program.
In particular, ‘23’ is a subform of the form (define x
23).