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#lang racket
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(define (lex<? a b)
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(cond ((null? b) #f)
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((null? a) #t)
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((= (car a) (car b)) (lex<? (cdr a) (cdr b)))
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(else (< (car a) (car b)))))
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(lex<? '(1 2 3 4 5) '(1 2 3 4 4)) ; -> #f
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