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(define off
(lambda (fix)
(set-intensity fix 0)))
(define set-all
(lambda (fixtures level)
(for-each (lambda (fix)
(set-intensity fix level))
fixtures)))
(define find-fixture
(lambda (fixtures name)
(cond
[(null? fixtures) #f]
[(eq? (fixture-name (car fixtures)) name) (car fixtures)]
[else (find-fixture (cdr fixtures) name)])))
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