Theory of Machine
Rectangular bar in a rectangular hole is the following type of pair

Completely constrained motion
Incompletely constrained motion
Partially constrained motion
Freely constrained motion

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Theory of Machine
The relation l = (2/3).(j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to

One lower pair and two additional links
Any one of these
Two lower pairs and two additional links
Two lower pairs and one additional link

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