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A letter is present in each day and afternoon, but it is absent from every morning, noon, and night. What is the name of the letter?
A man leaves home and takes three left turns. Upon arriving back home he comes across two men wearing masks. Who are these men?一个人离开家后,连续三次左转弯,又回到了家,在这个过程中,他遇到了两个带面具的人,请问他们是谁?
Which three letters can frighten a thief away?