[Python] How to delete the short lists from a long nested list even the items are not...

For example:

t=[[1, 2, 3, 4, 5, 6], [2, 3, 4, 5, 6], [2, 3, 4, 5, 6], [3, 5], [4, 5, 6],[4,5,6],[6,7], [6], [1]]


I want to delete the short lists if the items are included in a long one, even the items are not continuous. So, I expect the result to be:

[[1, 2, 3, 4, 5, 6],[6,7]]


What can I try next?

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