Potential answers for "Fitting abbr. hidden in "second nature""

⭐⭐⭐⭐ DNA
⭐⭐⭐ RNA
⭐⭐ LTR
⭐⭐ NCO
⭐⭐ OTOH
⭐⭐ ETA
⭐⭐ ECON
⭐⭐ NASA
⭐⭐ ETAL

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