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Comparison of chemical symbols:

CH2CIF=ClHF=C6H5CH2COOH=COOHCOH=0OH=C2\begin{aligned} & \mathrm{CH}_{2} \mathrm{CIF}=\mathrm{Cl}_{\mathrm{H}}^{\mathrm{F}}= \\ & \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}_{2} \mathrm{COOH}=\mathrm{COOH}^{-} \mathrm{COH} \\ & =\overbrace{0}^{\mathrm{OH}}=\mathrm{C}^{2} \end{aligned}