1*44147Sbosticstop at 4 2*44147Sbosticrun 3*44147Sbosticprint b 4*44147Sbosticstep 5*44147Sbosticprint b 6*44147Sbosticassign b = false 7*44147Sbosticprint b 8*44147Sbosticassign b = true 9*44147Sbosticprint b 10