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(read-from-string "(setq x 55) (setq y 5)") ⇒ ((setq x 55) . 11)
(read-from-string "\"A short string\"") ⇒ ("A short string" . 16)
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(read-from-string "(list 112)" 0)
⇒ ((list 112) . 10)
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(read-from-string "(list 112)" 1)
⇒ (list . 5)
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(read-from-string "(list 112)" 6 8)
⇒ (11 . 8)
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