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Estimated class based on density:
- Less than 1- class 400
- 1 but less than 2 – class 300
- 2 but less than 4 – class 250
- 4 but less than 6 – class 150
- 6 but less than 8 – class 125
- 8 but less than 10 – class 100
- 10 but less than 12 – class 92.5
- 12 but less than 15 - class85
- 15 or greater – class 70
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