This English Language quiz is called 'Non-Verbal Reasoning - Code Breaker 2' and it has been written by teachers to help you if you are studying the subject at middle school. Playing educational quizzes is a fabulous way to learn if you are in the 6th, 7th or 8th grade - aged 11 to 14.
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Codes tend to be for the purposes of secrecy.
The figures in the boxes on the left hand side of the page have been given letter codes that describe certain aspects of their appearance. Using this information you can find the code for the shape in the box on the right. There is a detailed explanation of how they work in the example question and answer, so just concentrate and think logically, and you shouldn't have any trouble.