N2\mathrm{N}_{2}N2 ও CO
C2H4\mathrm{C}_{2} \mathrm{H}_{4}C2H4 ও C2C_2C2
N2\mathrm{N}_{2}N2 ও O2O_2O2
COCOCO ও O2\mathrm{O}_{2}O2