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R2NH>RNH2>R3N>NH3>C6H5NH2
C6H5NH2>NH3>R3N>RNH2>R2NH
NH3>C6H5NH2>R2NH>R3>RNH2 
C6H5NH2>NH3>RNH2>R2NH>R3N
ANS : 1
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