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We use some conventions in this manual.
#t' or `non-#f'. This typically means that val
is returned if condition holds, and that ‘#f’ is returned
otherwise.
The symbol ⇒ is used to tell which value is returned by
an evaluation:
(+ 1 2)
⇒ 3
Some procedures produce some output besides returning a value. This
is denoted by the symbol -|.
(begin (display 1) (newline) 'hooray)
-| 1
⇒ hooray