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The Scheme procedure apply lets us call a procedure
on a list of its arguments.
(define x '(1 2 3))
(apply + x)
=> 6
In general, apply takes a procedure, followed by a
variable number of other arguments, the last of which
must be a list. It constructs the argument list by
prefixing the last argument with all the other
(intervening) arguments. It then returns the result of
calling the procedure
on this argument list. Eg,
(apply + 1 2 3 x)
=> 12
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