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K-means cluster results.
| 5 proposed 2 as the best number of clusters |
| 7 proposed 3 as the best number of clusters |
| 4 proposed 4 as the best number of clusters |
| 4 proposed 5 as the best number of clusters |
| 1 proposed 11 as the best number of clusters |
| 1 proposed 13 as the best number of clusters |
| 1 proposed 15 as the best number of clusters |
