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In Scheme, the boolean values true and false are denoted by #t
and #f. However, any Scheme value can be treated as a boolean
for the purpose of a conditional test. This manual uses the word
true to refer to any Scheme value that counts as true, and the
word false to refer to any Scheme value that counts as false. In
conditional tests, all values count as true except for #f, which
counts as false (see Conditionals).