3.5.1. Streams Are Delayed Lists
Complete the following definition, which generalizes stream-map to allow procedures that take multiple arguments, analogous to map in section 2.2.3, footnote 12.
(define (stream-map proc . argstreams) (if (<??> (car argstreams)) the-empty-stream (<??> (apply proc (map <??> argstreams)) (apply stream-map (cons proc (map <??> argstreams))))))
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