% Should I Stay or Should I Go?

A: I IV | I | 
B: IV bIII | IV |

In: $A*4
Vr: $A*2 $B $A V | | $A
Ch: $A*2 $B $A V | $A
Ou: $A $B $A V | $A

S: [D] $In $Vr*2 $Ch $Vr*2 $Vr $Ou