| http://www.w3.org/ns/prov#value | - In addition, these blocks have such a disadvantage as when they are connected to each other, at least one side surface of a structure never falls to become uneven in appearance, i.e., the lateral of a block is not flushed with that of another block connected to the former on the side and it is impossible to make all the side surfaces of the structure flat and even.
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