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//0x8 bytes (sizeof)
struct _ACPI_METHOD_ARGUMENT_V1
{
    USHORT Type;                                                            //0x0
    USHORT DataLength;                                                      //0x2
    union
    {
        ULONG Argument;                                                     //0x4
        UCHAR Data[1];                                                      //0x4
    };
};