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I had a strange dream last night.It's about past.In the dream,I'm in class with other strange people.I think so,because partly of them look like people but they are ghosts.I'm not scared.Nearly fourty years,I almost dream every night,I have done all kinds of dreams. In this dream,I beat a girl next to me,Of course,She is a ghost too,I find her secret,She is angry and put her hands over my face.I get angry too,I ride on her and think :Oh,Fortunately,I don't lose my weight.Sure,no one died. This isn't the climax of story. I arrive the other place.One person about 40 years old who pick me up and bring me get to a new place.He pointed to a black dog to me:"Hi you were a dog in past.But,It was not this dog.""A dog?So cool.Then,How does he look like?"I'm so happy that it's not a pig、a mouse,or such as other stupid anmials. "I want to see that dog-my preexistence."I beg him. At the moment,a grey dog appear in front of me.He looks like a golden retriever but his color is grey,a little travel-stained,A Tibetan man is taking him.I even don't konw that it is a girl or a boy.But ,I hope it is a boy.i don't know why ,The Tibetan man and a dog don't see me。 Then,the man says :The dog is good at catching ghosts,He lived with me when he was a pup. Just then,I wake up from the dream.