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Use "demark" in a sentence
"What had begun earlier as a thin line of sunlight had grown into the large rectangle of light that would demark the beginning and end of the forum."
"Many federal agencies that do R&D use the concept of Technology Readiness Levels (TRL) to demark the gradations between basic research and more applied (and commercially useable) research."
"This is a congruence of null geodesics which demark the "point of no return.""