In a certain coding system, 'rbm std bro pus' means "the puppy is beautiful", 'tnh pus dim std' means 'the sparrow is red', 'pus dim bro pus cus' means 'the sparrow has the puppy'. What is the code for 'has'?
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If a word appears in only one sentence, its code is likely the unique code that does not appear in other sentences.