Kemija - 2012./13. jesen - 35.

${\mathrm{S}}_2{\mathrm{O}}_5{}^{2-}\backslash mathrm\{S\}\_\{2\}\; \backslash mathrm\{O\}\_\{5\}\{\}^\{2-\}$

${\mathrm{S}\mathrm{O}}_4{}^{2-}\backslash mathrm\{SO\}\_\{4\}\{\; \}^\{2-\}$

${\mathrm{S}\mathrm{O}}_3{}^{2-}\backslash mathrm\{SO\}\_\{3\}\{\; \}^\{2-\}$

${\mathrm{S}}_2{\mathrm{O}}_3{}^{2-}\backslash mathrm\{S\}\_\{2\}\; \backslash mathrm\{O\}\_\{3\}\{\; \}^\{2-\}$