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

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

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Theory of Machine
In a four bar chain or quadric cycle chain

Three are turning pairs and one is a sliding pair
Each of the four pairs is a turning pair
One is a turning pair and three are sliding pairs
Two are turning pairs and two are sliding pairs

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