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The keyboard shortcut 'k' to mark a word as 'known' works only for blue (unknown) words. I would find it logical and highly convenient if it worked also for already created lingqs with the same effect as clicking the check mark on the "1 2 3 4 ✓ x" scale in the upper right corner. When I press 'k' on a lingq, it simply jumps to the next lingq and does nothing.