Question 1073522
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Let me simplify the problem.

Let A = {1,2}  and  B = {2}.

Can you find A - B on your own ?


Let it will be your FIRST step.
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As the second step, read attentively what you are given - the text, the definitions, the example - and EVERYTHING must be clear to you,
because it is explained very carefully.


I just see that you are able to copy and past the text and to submit it to the forum.


I can not believe that you are not able to understand what is written in your instruction !


You can !!