_:n784f15c823e74b498a96ad43d2a2332cxb0
<http://schema.org/description>
"opslaan van de posities (x1,y1) en (x2,y2) make pos1 pos. make pos2 pos. de waarde 300 – 2 * (x1 – x2) berekenen. 300 – 2 * ( (item 1 :pos1) – (item 1 :pos2) )"
<https://slideplayer.nl/slide/2058263/>