Differences in median abundances of A(Li), [C/Fe], [N/Fe], [O/Fe], and [Na/Fe] between 1P and 2P stars (violet) and 1P and anomalous (red) stars. The green lines separate the regime where 2P and anomalous stars are enriched or depleted (see text for details). The y-axis scale is adjusted in each plot to optimize clarity. The smaller dots indicate GCs where the Δ[C/Fe] and Δ[N/Fe] measurements are derived from RGB stars brighter than the bump.