Number of linearly independant motions

[princejan7]

Homework Statement

http://postimg.org/image/uc0c581cb/

For (b), how many points of linearly independent motion are present in this system?

Homework Equations

The Attempt at a Solution

The solution says there is rotation of J1, between K1 and D1, to the right of K2 and finally J3

But isn't there also rotation for J2?

 

[mfb]

I agree, there should be J2. On the other hand, one degree of freedom corresponds to a global motion of the whole system, which might be irrelevant, so you can fix one rotation.