The expression of 1-4 is not clear and concise, including that the word itself is contradictory, and one of them means unique, including that there are many expressions that are contradictory; Other shapes, or other shapes, cannot be written into the claims, because the scope of the right of expression is not clear, which combines the lower concept with the upper concept. This unimportant lower-level feature can be written in the specification, and it is completely unnecessary to write it in the claim.
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