The nomenclature of amines

Unfortunately, there are three sytems of nomenclature of the amines: a)The scientific I.U.P.A.C. system consistent with the →    table of functional groups : N,N-dimethylbutan-2-amine b)The ancient system still in use where the nitrogen atom alone acts as the main chain, all branches on the nitrogen being considered as side chains : Dimethylpropylamine c)A third deprecated system, where the nitrogen atom is always designated by the prefix amino. 1-(methylamino)propane