$4.$ Calculate the mobility $($links$,$ joints, and DOF$)$ for the following linkages and machines:Note: Record links and joints according to their colors. See example below. Example Answer: L $=4$: Ground, green gear, blue gear, orange gearJ$1=3$: blue gear to ground, green gear to ground, orange gear to groundJ$2=2$: blue gear to orange gear, green gear to orange M$=3(4-1)2(3)2=1$