| Name | Description | Type | Package | Framework |
| Counter | A counter keeps track of the number of occurrences of numbers. | Class | com.numericalmethod.suanshu.combinatorics | SuanShu |
| Ties | Count the number of occurrences of each distinctive value. | Class | com.numericalmethod.suanshu.combinatorics | SuanShu |
| Twiddle | Generates all combinations of M elements drawn without replacement from a set of N elements. | Class | com.numericalmethod.suanshu.combinatorics | SuanShu |