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测试通过

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def triangles():

    n = 1

    L = [1]

    l = []

    while n>=0:

        yield(L)

         n = n + 1

        if n == 2:

            L = [1,1]

        if n >= 3:

            l = L

            L = [1,1]

            for i in range(n-2):

                L.insert(i+1,l[i]+l[i+1])

    return 'done'


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