How can I modify this drawing to have fail safe

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Keeeen
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This pneumatic circuit currently operates both of the cylinders automatically when the start valve is actuated. I want to modify the circuit so it will fail safe and park both the cylinders in the retracted position
Hand-drawn pneumatic circuit schematic on lined paper showing two double-acting cylinders labelled A0/A1 and B0/B1, with 3/2 and 5/2 directional valves, roller limit valves, a start valve and a regulator.
 
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  • Hand-drawn pneumatic circuit schematic on lined paper showing two double-acting cylinders labelled A0/A1 and B0/B1, with 3/2 and 5/2 directional valves, roller limit valves, a start valve and a regulator.
    DSC_0469~2.JPG
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Discussion

What is your attempt at a solution?
 
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What type of failure(s) are you addressing, i.e. supply power loss or other?
 

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