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