R3N>R2NH>RNN2>N3R_{3} N>R_{2} N H>R_{N} N_{2}>N_{3}R3N>R2NH>RNN2>N3
R2NH>R3 N>RNH2>NH3\mathrm{R}_{2} \mathrm{NH}>\mathrm{R}_{3} \mathrm{~N}>\mathrm{RNH}_{2}>\mathrm{NH}_{3}R2NH>R3 N>RNH2>NH3
R2NH>RNH2>R3 N>NH3\mathrm{R}_{2} \mathrm{NH}>\mathrm{RNH}_{2}>\mathrm{R}_{3} \mathrm{~N}>\mathrm{NH}_{3}R2NH>RNH2>R3 N>NH3
R2NH>RNH2>NH3>R3 N\mathbf{R}_{2} \mathrm{NH}>\mathrm{RNH}_{2}>\mathrm{NH}_{3}>\mathrm{R}_{3} \mathrm{~N}R2NH>RNH2>NH3>R3 N