PROTOXIDE is validvalid

that one of a series of oxides having the lowest proportion of oxygen, also PROTOXID

110,305 of 196,601 in NWL2023·also valid in CSW24

that one of a series of oxides having the lowest proportion of oxygen, also PROTOXID

192,209 of 280,887 in CSW24·also valid in NWL2023

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