How to remove duplicates in this list?

Question

I am trying to remove the duplicates in the following list

[[{1, 2, 3, 8, 9, 10}, {4, 5, 7}, {5, 6, 7}], 
 [{1, 2, 3, 4, 5}, {6, 7, 8, 9, 10}], 
 [{4, 5, 7},