restart -force -nowave
view wave
delete wave *
add wave KEY(0) 
add wave KEY(3)
add wave KEY(1)
add wave LEDG(0)
force -freeze KEY(0) 0 0, 1 5ns -r 10ns
force -freeze KEY(3) 1 0, 0 2ns, 1 4ns, 0 112ns, 1 114ns
force -freeze KEY(1) 1 0, 0 50ns, 1 80ns
run 150ns