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Letter to Three Brothers
H2O+SiO2+Fe304+CO2-0O {lx3ty?IP=x2y]ioo}
H2O+SiO2+Fe304+CO2-0O {lx3ty?IP=x2y]ioo}

What do the chemical formula and mathematical formula in this letter express respectively?
What do the chemical formula and mathematical formula in this letter express respectively?