What Is This Plant?

Question

Could you please tell what this plant is? It is about nine inches in height and looks like a good border plant.

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Answer 1

My colleagues are suggesting that this is either liriope or sweet flag grass. Here are articles on both:
https://www.gardeningknowhow.com/ornamental/groundcover/monkey-grass/liriope-grass-edging.htm
https://www.gardeningknowhow.com/ornamental/water-plants/sweet-flag-grass/growing-sweet-flag-grass.htm