II. DEGREE OF FREEDOM OF MECHANISMS AND CLASSIFICATION OF MECHANISMS 2.1 Degree-of-freedom of Mechanisms -Mechanism Examples 2.2 Constrained Mechanisms 2.3 Kinematic Inversion 2.4 Grübler’s Equation 2.5 Enumeration of Kinematic Chains and Mechanisms 2.6 Spherical and Two-Dimensional Space 2.7 Classification of Mechanisms