Kemija - 2012./13. jesen - 30.

$[\mathrm{C}\mathrm{u}({\mathrm{H}}_2\mathrm{O}{)}_4{]}^{2+}[\backslash mathrm\{Cu\}(\backslash mathrm\{H\}\_\{2\}\; \backslash mathrm\{O\})\_\{4\}]^\{2+\}$

${\mathrm{H}\mathrm{P}\mathrm{O}}_4{}^{2-}\backslash mathrm\{HPO\}\_\{4\}\{\; \}^\{2-\}$

$\mathrm{H}\mathrm{F}\backslash mathrm\{HF\}$

$\mathrm{H}\mathrm{C}\mathrm{O}\mathrm{O}\mathrm{H}\backslash mathrm\{HCOOH\}$