It passes but you never hear it. Sometimes though, you think you feel it. You think you had it but it's gone. You want to stop it, but it moves on. You lose it, gain it, maybe fear it, but it goes on, forever on.
Answer: time
Select a pack of riddles and try to solve it in an interesting way.
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Complete the grid by using logic and the given clues of each problem.
Use logic deductions to solve problems that are similar to the Einstein's Riddle.