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Description of the five clusters including the involved AUs and a potential interpretation of the meaning.
| Cluster | Involved action units | Potential interpretation |
|---|---|---|
| 1 | AU12 | neutral to slight smile |
| 2 | AU6, AU9, AU10, AU12 | smiling |
| 3 | AU4, AU9, AU28 | frowning |
| 4 | AU9, AU17, AU18, AU24 | frustrated |
| 5 | No above threshold AU | neutral |
