------
## 最终结论
```python
def assign_freq(tuple_list):
    freq_dict = {}
    
    for tup in tuple_list:
        if tup in freq_dict:
            freq_dict[tup] += 1
        else:
            freq_dict[tup] = 1
            
    result = [(tup + (freq_dict[tup],)) for tup in freq_dict]
    
    return result
```