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(display ((lambda (str from to)
(let ((i (string-index str (string->char-set from))))
(string-replace str to i (+ i (string-length from)))))
(number->string (let* ((a (read)) (b (read)) (c (read)) (d (read)))
(+ (/ a b) (/ c d))))
"/"
" "))
(newline)
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