sp2−sp3\mathrm {s p^{2}-s p^{3}}sp2−sp3
sp−sp3\mathrm {s p-s p^{3}}sp−sp3
sp−sp2\mathrm {s p-s p^{2}}sp−sp2
sp3−sp3\mathrm {s p^{3}-s p^{3}}sp3−sp3
sp2−sp2\mathrm {s p^{2}-s p^{2}}sp2−sp2