Amino acids placed on a cation exchange resin containing sulfonate (-SO3-) groups flow down the column at different rates because of two factors that influence their movement: (1) ionic interactions between the sulfonate residues on the column and positively charged functional groups on the amino acids, and (2) hydrophobic interactions between amino acid side chains and the strongly hydrophobic backbone of the polystyrene resin. For each pair of amino acids listed, determine which will be eluted first from the cation exchange column by a pH 7 buffer.