An instantaneous configuration of a four-bar mechanism, whose plane is horizontal, is shown in the figure below. At this instant, the angular velocity and angular acceleration of link O2A are $\omega8red/s$ and $\alpha=0$, respectively, and the driving torque $(t)$ is zero. The link O2A is balanced so that its center of mass falls at O2.
Which kind of 4-bar mechanism is O2 ABO4?
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