The ouput Vo graph that is clipped
If all components are ideal, the circuit has a serious problem. Look at this partial diagram:







simulate this circuit &ndash; Schematic created using CircuitLab

A current will flow from BAT1 to BAT2, not limited by any resistance! So this is a perfect recipe for fireworks.

Even if the components are not ideal, you still have a serious problem. The diodes will overheat and/or the batteries may be overloaded.