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Instalment of a facial expression is associated with contractions and 6 extensions of specific facial muscles. Noting that expression is about changes, we 7 present a model for expression classification based on facial landmarks dynamics. Our 8 model isolates the trajectory of facial fiducial points, by wrapping them up in relevant 9 features and discriminating among various alternatives with a machine learning 10 classification system. The used features are geometric and temporal based and thedoi:10.3906/elk-1607-113 fatcat:sx3gfllsmvejvfuuysk2lum6o4