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Question: How save the members in set in the order of input?

Question: How save the members in set in the order of input?

lcz 994 Maple
set
July 10 2019
0

        I  want save a set as shown below:
         E:={{1,2,3,4,5,6},{4,5,6,7,8,9,10,11},{10,11,12,13,14}};
         The output is 
                     E := {{10, 11, 12, 13, 14}, {1, 2, 3, 4, 5, 6}, {4, 5, 6, 7, 8, 9, 10, 11}}
          The order of set is changed; I have known the list can do it following my order,
       E:=[{1,2,3,4,5,6},{4,5,6,7,8,9,10,11},{10,11,12,13,14}];
but I want to know what can I do in set?
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