Ace Novelty wishes to produce three types of souvenirs: type A, B, C. To manufacture a type-A souvenir requires 2 minutes on machine I, 1 minute on machine II, and 2 minutes on machine III. A Type-B souvenir requires 1 minute on machine I, 3 minutes on machine II, and 1 minute on machine III. A type C souvenir requires 1 minute on machine I and 2 minutes each on machines II and III. There are 3 hours available on machine I, 5 hours available on machine II, and 4 hours on machine III, for processing the order. How many souvenirs of each type should Ace Novelty make in order to use all of the available time