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Is it possible to read more than one S-expression on a single line? To determine this, let’s evaluate the expression (progn (list (read) (read))).
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Here’s how the evaluation process works:
  1. The expression (read) is used to read and retrieve the first S-expression from the input.
  2. The expression (read) is evaluated again, but this time it reads and retrieves the second S-expression from the input.
  3. The two S-expressions are then combined into a list using the (list) function.
  4. Finally, the (progn) function evaluates the list and returns the result.
Therefore, if you input more than one S-expression on a single line, the expression (progn (list (read) (read))) will read and evaluate both S-expressions, and return a list containing the results.
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