Guys, this seems like a serious question, and a lot of these answers really aren't helping.
Look at the blue box under R9. The blue box provides "examples of items that will violate R9". In that list is:
Quote:
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G.Hydraulic fluids or hydraulic items
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Typing "hydraulic fluid" in google gives, before any links, a paragraph that starts "Common hydraulic fluids are based on waste, mineral oil or
water."
Water is a hydraulic fluid. Hydraulic fluids are specifically listed as something that violates R9. R9 is a robot rule that must be followed to pass inspection and play. Thus water is illegal. QED.