3 V1 1 0 pulse iv=0 pv=1 duty=.3 freq=1000 rise=.1m fall=.1m
4 V2 2 0 pulse iv=0 pv=1 duty=.5 rise=.1m fall=.1m
5 V2b 2b 0 pulse iv=0 pv=1 duty=.5 rise=.1m fall=.1m phase=-3.1415
6 V2c 2c 0 pulse iv=0 pv=1 duty=.5 rise=.1m fall=.1m phase=6.28
8 V3 3 0 pulse iv=0 pv=1 duty=.4 freq=2000 rise=.1m fall=.1m
9 V4 4 0 pulse iv=0 pv=1 rise=.1m width=.5m fall=.1m
14 .tran 0 1m 50u trace=n