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We refine a previously determined Si abundance and derive with confidence abundances for C, N and O which are poorly known in DLAs. The [O/Fe] ratio is ~0.6, but we cannot establish if iron is partially locked into dust grains. The [C/Fe]=0.08 \\pm 0.13 and [Si/C]=0.31 \\pm 0.07. [N/O] and [N/Si] are about -1, which is consistent with the majority of DLAs. 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