------
## 最终结论
```python
def sum_squares(lst):
    total_sum = 0
    for index, value in enumerate(lst):
        if index % 3 == 0:
            total_sum += value ** 2
        elif index % 4 == 0 and index % 3 != 0:
            total_sum += value ** 3
        else:
            total_sum += value
    return total_sum
```