I think Mr Dybvig is using r6rs syntax. In r7rs it would involve the "import" macro/function and you could use r7rs.scm in the s7 code. But that code just does what you did by hand. Also, the bracket-for-parenthesis (or is it any-number-of-parentheses?) is probably from r6rs scheme. So, you did the right thing! Does that code's output look right to you?
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