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

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

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Theory of Machine
In a single slider crank chain

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

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