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The `delay' construct is used together with the procedure
implement lazy evaluation or call by need.
(delay <expression>) returns an object called a
promise which at some point in the future may be asked (by
the `force' procedure)
<expression>, and deliver the resulting value.
The effect of <expression> returning multiple values
See the description of `force' (section see section 6.4 Control features) for a more complete description of `delay'.
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