`Na^(+) LT F^(-) O^(2-) GT N^(3-)` `F^(-) lt O^(2-) lt N^(3) gt Na^(+)` `O^(2-) lt N^(3-) lt F ^(-) gt Na^(+)``N^(3-) lt Na^(+) gt F ^(-) gt O^(2-)`
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