The spacing of the counterforts usually varies from .................. of the height of the wall

- 1
  
  $\frac{1}{8}$ to $\frac{1}{6}$
- 2
  
  $\frac{1}{6}$ to $\frac{1}{3}$
- 3
  
  $\frac{1}{3}$ to $\frac{1}{2}$
- 4
  
  $\frac{1}{2}$ to $\frac{1}{4}$

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