purdue was co champions with michigan because prior to 1946 the big ten did not count ties. so a team with a 5-0-1 record would be viewed as winning percentage of 1.000 same as Michigan with a 6-0 record 1.000 please read the second paraga on page 1 of this purdue football media guide 
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It's very important that contributors understand and follow these practices, as policy requires that people who persistently do not must be blocked from editing. If you have any questions about this, you are welcome to leave me a message on my talk page. Thank you. Ruby Murray 14:44, 30 October 2013 (UTC)
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