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Match each set builder expression with the correct interval by selecting a letter from each drop down selector.

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  1. `[a,+oo)`
  2. `[a,b)`
  3. `(-oo,+oo)`
  4. `(a,b)`
  5. `(-oo,b)`
  6. `(-oo,b]`
  7. `(a,+oo)`
  8. `(a,b]`
  9. `[a,b]`