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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 deactivateAaPdpContextRequest():
 """DEACTIVATE AA PDP CONTEXT REQUEST Section 9.5.13"""

    a = TpPd(pd=0x8)
    b = MessageType(mesType=0x53)  # 01010011
    c = AaDeactivationCauseAndSpareHalfOctets()
    packet = a / b / c
    return packet