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    window=tk.tk

    width=window.winfo_screenwidth

    height=window.winfo_screenheight

    a=random.randrange(0，width)

    b=random.randrange(0，height)

    window.title(‘u.e.cwillcome‘)

    window.geometry(“200x50“+“+“+str(a)+“+“+str(b))

    tk.label(window，text=‘u.e.cwillcome‘，bg=‘green‘，

    font=(‘kaiti_gb2312‘，17)，width=20，height=4).pack

    window.mainloop

    threads=[]

    foriinrange(100):
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