Solenoids and <R74>

[implosionprez]

<R74>: Each commanded motion of a pneumatic cylinder or rotary actuator must be accomplished via the flow of compressed air through only one approved pneumatic valve. Plumbing the outputs from multiple valves together into the same input on a pneumatic cylinder is prohibited.

How would everyone translate this rule? It obviously means that we can't connect the outputs of more than one solenoid to a cyllinder, but what about connecting the input of a second solenoid to the outputs of the first solenoid, to control whether or not air can come out of the first solenoid? Would that be legal, or does one solenoid and one solenoid alone have to control the movement of the piston?