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Use "unsolved" in a sentence
"David Benqué's Infinite Adventure Machine creates random folk-tales, and is itself an adventure in what he describes as an unsolved computer science problem: automatic story generation."
"Pendulum on the Dance Floor: The great mystery underlying the French scientist Leon Foucault's pendulum might remain unsolved since the giant brass instrument was irreparably damaged at the Musee des Arts et Metiers (Museum of Arts and Industry) in Paris."
"The death toll continues to climb and many crimes remain unsolved, leaving the community with little recourse but to take matters into their own hands by forming grassroots non-profit groups to shed light on the issue of the border city femicides."