Subset Validation

Write a function that returns True if all subsets in a list belong to a given set.

Examples

validate_subsets([[1, 2], [2, 3], [1, 3]], [1, 2, 3]) ➞ True

validate_subsets([[1, 2, 3], [2], [3], []], [1, 2, 3]) ➞ True

validate_subsets([[1, 2], [2, 3], [1, 4]], [1, 2, 3]) ➞ False

validate_subsets([[1, 2, 3, 4]], [1, 2, 3]) ➞ False

Notes

• The empty set and the set itself are both valid subsets of a set (we are not talking about proper subsets here).
• The set and the subset will each have unique elements.