a # # b; // Is it '(a#) # b' or 'a # (#b)'? You can't tell.You run into the same ambiguity when mixing operators of different fixities. For example, if # can only be prefix or infix, and $ can be either infix or postfix, you still end up with an ambiguity:
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Are robot mops safe for hardwood floors?Most robot mop cleaning solutions sold by the brands themselves are totally hardwood safe, as long as the finish isn't already peeling. The sanitizing formulas have a neutral pH balance (pH 6.5 to 7.5) and avoid topcoat-damaging ingredients like ammonia or other alkaline products. If you want to be extra careful about preventing damage, you can lower the water flow level in the app or mop with just water sometimes.