00 0101 1100 + 00 1100 0110

    1 1 11 1
   00 0101 1100
 + 00 1100 0110
----------------
   01 0010 0010
   
      1111
   00 1100 0110
 - 00 0101 1100
 ---------------
   00 0110 1010




a =     1100        {3, 2}
b =     0110        {2, 1}
a&b =   0100        {2}         a ⋂ b
a|b =   1110        {3, 2, 1}   a ⋃ b

A set X is a subset of a set Y iff
    every element in X is also in Y
A set X is a superset of a set Y iff
    Y is a subset of X
    every element in Y is also in X

    a & b means a ⋂ b   TRUE
    a & b means a ⋃ b   FALSE
    a ⊆ (a | b)           TRUE
    b ⊆ (a | b)           TRUE
    a ⊇ (a | b)           FALSE
    b ⊇ (a | b)           FALSE



00011111
00000111


00010111
11101001
11111101