Table 1.
| Height | ||||
| Area | A (1–2 cm) | B (2–3 cm) | C (>3 cm) | |
| a (1–4 cm2) | 72 | 8 | - | |
| b (4–10 cm2) | 18 | 2 | 2 | |
| c (> 10 cm2) | - | 4 | 4 | |
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