ㄴ and ㄹ side by side, in either order, both sound like ㄹ: [ㄹㄹ].
Spot ㄴ+ㄹ and ㄹ+ㄴ and read them as [ㄹㄹ], e.g. 신라 [실라], 설날 [설랄].
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