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make-concatenated-stream  &rest input-streams ⇒  concatenated-stream
input-stream—an input stream.
concatenated-stream—a concatenated stream.
Returns a concatenated stream that has the indicated input-streams initially associated with it.
 (read (make-concatenated-stream
         (make-string-input-stream "1")
         (make-string-input-stream "2"))) ⇒  12
Should signal type-error if any argument is not an input stream.