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