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

⭐⭐⭐⭐ DNA
⭐⭐⭐ RNA
⭐⭐ ETA
⭐⭐ ECON
⭐⭐ NASA
⭐⭐ ETAL
⭐⭐ ESD
⭐⭐ ETC
⭐⭐ LTR

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