Peace of Mind Investments maintains a data base of companies they recommend to clients interested in investing only in organizations with the highest ethical standards. The most prominent companies listed in its data base are listed in the set
    %0.
A search of the database for companies that have contributed to charitable causes yields the subset
    %1.
Another search, this time for companies known for their low carbon footprints, yields the subset
    %2.
A third search, for companies whose boards of directors have earned awards for ethical standards yields
    %3.
Enter the first letter of each element in the appropriate place, separated by commas if there is more than one element. If the associated subset is empty, leave it blank.
A B C
BOX  BOX
BOX
 
BOX
 
BOX
BOX  BOX
 BOX
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MESSAGE
Use set operations to describe the following subsets, and list their elements.

1. Those companies %4:
    BOX = $\Big\{{}$BOX${}\Big\}$
    Use cup for union and cap for intersection.

    BUTTONS
2. Those companies %5:
    BOX = $\Big\{{}$BOX${}\Big\}$
    Use cup for union and cap for intersection.

    BUTTONS
3. Those companies %6:
    BOX = $\Big\{{}$BOX${}\Big\}$
    Use cup for union and cap for intersection.

    BUTTONS
4. Those companies %7:
    BOX = $\Big\{{}$BOX${}\Big\}$
    Use cup for union and cap for intersection.

    BUTTONS
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