Description: Using digital sub-matching methods, the number is divided into horizontal, vertical, the left arc, right arc, arc the first half, second half of arc, S, anti-S, ring a total of nine kinds of elements, the number of elements in accordance with the upper and lower, left, right, in the relative relationship between the five kinds of definition. At this time do not use absolute position, and relative position with a more robust, so that a total of 45 dimensions.
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