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Match each set builder expression with the correct interval by selecting a letter from each drop down selector.
- `(-oo,b)`
- `(a,+oo)`
- `(a,b]`
- `[a,b]`
- `(a,b)`
- `[a,+oo)`
- `(-oo,+oo)`
- `[a,b)`
- `(-oo,b]`
Box 1: In each pull-down on the left, select the letter (a, b, c, etc.) of the matching answer in the right-hand column