| 摘要 |
The building block is provided. The block is substantially rectangular and has opposed first and second ends. First and second substantially congruent rectangular panels extend between the ends and are joined together by at least one web. Each panel has vertical end edges that are notched to fit with the end edges of another such block. The notches are disposed selectively on inside or outside corners of the respective blocks to enable adjacent blocks to interfit in a vertical joint.
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