| 摘要 |
A construction apparatus including a body having a front, a rear, a top, a bottom, and first and second opposite sides. The front has a front surface having a plurality of block images configured to generally depict a pluralit y of courses of blocks, each of the courses having a respective course width. The first and second sides have generally complementary step shapes including at least two rises and at least one run between the rises, each rise being abou t equal to one of the course widths or a sum of a plurality of the course widths.
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