Please solve the programming task below using a self-contained code snippet in a markdown code block.

Given the array favoriteCompanies where favoriteCompanies[i] is the list of favorites companies for the ith person (indexed from 0).
Return the indices of people whose list of favorite companies is not a subset of any other list of favorites companies. You must return the indices in increasing order.
 
Please complete the following python code precisely:
```python
class Solution:
    def peopleIndexes(self, favoriteCompanies: List[List[str]]) -> List[int]:
```