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Consider the following motions:

1.  Piston reciprocating inside an engine cylinder                                                                                 

2.  Motion of a shaft between foot-step bearings

         Which of the above can rightly be considered as successfully constrained motion?

         (a) 1 only                    (b) 2 only

         (c) Both 1 and 2         (d) Neither 1 nor 2

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