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1. modulo two sum(Can we verify⁽⁺⁾ this sense?)
2. This term needs a definition. Please help out and add a definition, then remove the text {{rfdef}}.
   • 2023, M. Fontela, A. Velo, P. J. Brown, F. F. Pérez, “Carbonate System Species and pH”, in Julián Blasco, Antonio Tovar-Sánchez, editors, Marine Analytical Chemistry, Cham: Springer, →ISBN, page 4:

     The sum of the three dissolved forms (CO₂, HCO₃⁻, and CO₃²⁻) is called total dissolved inorganic carbon and can be denoted by several notations: C_T, DIC, TIC, ⨊CO₂, TCO₂, or even “dissic.” Here we will use C_T, and it is one of the MCS variables that can be quantitatively determined.