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Author Topic: M-S progressive difficulty history  (Read 2400 times)


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M-S progressive difficulty history
« on: January 11, 2013, 11:28:37 PM »
Hi there. Who can tell me when Monday through Saturday progressive difficulty first began? Was it already in existence in the 60's? I'm doing research for a novel and haven't been able to find an answer online. Thanks for your help!


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