Try the puzzles in this worksheet for the talk - Puzzles and Thinking. Send your answer to kinlian@gmail.com. I will check and reply to you. (No prize, sorry. but you do not need to pay any fee either).
http://tankinlian.com/admin/file.aspx?id=747&IID=753
http://tankinlian.com/admin/file.aspx?id=747&IID=753
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