Question 3:
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Application software development requires knowledge 
about the application domain.

PART 1:
What is the relation number for relation R2(x1,x2,x3)
defined by x1 + x2 + x3 = 2?

PART 2:
If the type of a derivative contains only relation R2,
what is the lowest price p so that you are guaranteed 
not to lose money if you offer the derivative at price p?