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Well, s-expressions are not Lisp. Not every s-expression is a valid Lisp program.

(1 * 2 ^ 3 + 1) is a valid s-expression, but not a valid Lisp program. With an INFIX macro it could be:

(infix 1 * 2 ^ 3 + 1) could be a valid Lisp program, with a corresponding infix macro.

But the Lisp syntax still is on top of the s-expression syntax...




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