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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 vgcsUplinkGrant():
 """VGCS UPLINK GRANT Section 9.1.49"""

    a = TpPd(pd=0x6)
    b = MessageType(mesType=0x9)  # 00001001
    c = RrCause()
    d = RequestReference()
    e = TimingAdvance()
    packet = a / b / c / d / e
    return packet