Examples of Grashof Criterion for Four-Bar Mechanisms

For a four-bar mechanism with the following dimensions, (3, 8, 6, 7), a Grashof mechanism:

The mechanism is crank-rocker if 8 is fixed.

The mechanism is crank-crank if 3 is fixed.

The mechanism is crank-rocker if 3 is the coupler.

For a four-bar mechanism with the following dimensions, (3, 10, 5, 6), a non-Grashof mechanism:

The mechanism is rocker-rocker if 5 is fixed.	The mechanism is rocker-rocker if 10 is fixed.
The mechanism is rocker-rocker if 6 is fixed.	The mechanism is rocker-rocker if 3 is fixed.