Question: invalid if statement termination


While running a maple code, I am getting a "invalid if statement termination" error. Most of time when I use nested for loop and if statement inside the loop, I am getting this error. Another error I get frequently is "Error, unterminate loop". I am using "shift+Enter" instead of Enter to avoid blanks but still such error appears. Can any one provide some rules which I should keep in mind to avoid these errors. My maple worksheet is enclosed-

Thanks and Regards,


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