Long description: Block221_Fig21
Alt text: A diagram shows a series of black dots followed by two adjacent, unfilled rectangular blocks with numerical measurements above and below.
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- The diagram begins with a line segment marked by a series of black dots, suggesting a measurement of 33.4.
- Below and to the right of the dots, there are two adjacent, unfilled rectangular blocks.
- The first block is positioned between the measurements 39 and 45.05.
- The second block is positioned between the measurements 45.05 and 48.55.
- Above the right edge of the second block, a value of 50.4 is indicated.