Slider Family

 slide down, slide up, slide down, slide up

Action

//www.youtube.com/embed/YTxSNWvyqH8#t=0.5

 Pupil example

//www.youtube.com/embed/yTiSSDYtIv4#t=0.5

 Teacher example

//www.youtube.com/embed/mdWi_kmfJvY#t=0.5

down, bump, pen off, slide in, slide out

Action

//www.youtube.com/embed/uo8n5PN-DXw#t=0.5

 Pupil example

//www.youtube.com/embed/jMe1u0zAhnE#t=0.5

 Teacher example

//www.youtube.com/embed/LFvgBP7kEx0#t=0.5