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| Dataset | Reference | No. of review statements with labelled features with opinion |
|---|---|---|
| Canon digital camera | D1 | 238 |
| Nikon digital camera | D2 | 159 |
| Nokia cellphone | D3 | 265 |
| Creative MP3 player | D4 | 720 |
| Apex DVD player | D5 | 344 |
