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Give an example of infinitely many sets of real numbers, called such that all four conditions...

Give an example of infinitely many sets of real numbers, called B_1, B_2, B_3,... such that all four conditions are satisfied at once. They are: i) each set B_n is bounded above. ii) sup B_m = sup B_n for all m and all n. iii) the intersection of B_m and B_n is empty whenever m and n are not equal. iiii) for all n, sup B_n is not an element of B_n.

Not sure what to do here, but I believe it can be done using the fact that there is infinitely many prime numbers and that every rational number has a unique representation in lowest terms.

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