b.png "fig:"){width="\linewidth"}  [.0]{} ![Heatmaps showing the frequency distribution of the top 00 hand shape classes. Each heatmap, assigned to one hand shape class (briefly mentioned as HSH), shows the frequency of facial expressions on the assigned hand shape class over the facial expression graph of seven basic universal emotions and their primary, secondary, and tertiary dyads. As they show, more than one facial expressions are expressed within a single hand shape class.[]{data-label="heatmaps"}](Figures/HM_HSH_