Answers:
When you enter parameters for PWL source, you should give increasing time points. For example, you should give first time instant as 2, then the voltage value at t=2, then next instant as 3 (say), its voltage value, then t = 4 etc.
You cannot give time instants as 2, then 1, 1 - this is incorrect.
You cannot give time instants as 2, then 1, 1 - this is incorrect.
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