, ... ] gives the elements in eall which are not in any of the .
The list returned by Complement is sorted into standard order.
, ... ,
] applies test to each pair of elements in eall and the to determine whether they should be considered the same.
See the Mathematica book: Section 1.8.8.
See also: Intersection, Union.
This gives all those elements of the first list that do not appear in either of the other two lists.
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