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First, I thought of the rhyme ''30 days hath September, April, June and November - all the rest have 31, except for February alone" then I realised that February must be the second month so i put it into place. Then I realised that January must start on the day before February starts, so I found one with 31 days, ending on the day February starts. Then I thought of March, so I found one with 31 days, starting on the day after Feb ended. Then I did the same thing for each month, until I got to the end.