What do all of the compounds in the Amine class have in common?

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All amines have a nitrogen at their core.  This amine can be a primary amine (R-NH2) where the nitrogen is bound to 1 carbon atom and 2 hydrogen atoms.  It can be a secondary amine (R-(NH)-R) where the nitrogen is bound to two different carbon atoms and 1 hydrogen atom.  It can also be a tertiary amine (R-(NR)-R) where the nitrogen atom is bound to three different carbon atoms.  But all amines contain a nitrogen atom that is not a part of an aromatic system (that is to say that the nitrogen is not part of a double bond).