Enumerate Subsets

nums contains distinct integers. Return all subsets. Each subset must be sorted ascending and the OUTER list must be in Python lexicographic list order (the empty list comes first, a prefix comes before extensions). Input order does not affect output. At most 10 integers. Return [[]] for empty input. Examples (JSON; null means Python None): Input: {"nums": [2, 1]} Output: [[], [1], [1, 2], [2]] Input: {"nums": []} Output: [[]]

def subsets(nums: list[int]) -> list[list[int]]:
    """Enumerate subsets in deterministic lexicographic order."""
    pass