A 2-pole, 4-position rotary switch is to be wired, as shown below, to satisfy the requirement.
Position 'a' : Off
Position 'b' : 1-2-4
Position 'c' : 1-2-3
Position 'd' : 1-3-4
A 2-pole, 4-position rotary switch is to be wired, as shown below, to satisfy the requirement.
Position 'a' : Off
Position 'b' : 1-2-4
Position 'c' : 1-2-3
Position 'd' : 1-3-4