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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.
=> is used to tell which value is returned by
(+ 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
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