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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def rrCellChangeOrder():
 """RR-CELL CHANGE ORDER Section 9.1.21e"""

    a = TpPd(pd=0x6)
    b = MessageType(mesType=0x8)  # 00001000
    c = CellDescription()
    d = NcModeAndSpareHalfOctets()
    packet = a / b / c / d
    return packet