Opdracht 3 op film uitgelegd
F-19 https://www.youtube.com/watch?v=pCo9lLHTw8Y
Cl-35 https://www.youtube.com/watch?v=VE4Lv-kMn_c
Si-28 https://www.youtube.com/watch?v=0AYh4_ymcGU
C12+14 https://www.youtube.com/watch?v=9ZRz611P2Dw
F/Cl en C/Si https://www.youtube.com/watch?v=5ZinHspX5W8