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//0x18 bytes (sizeof)
struct _ACTIVATION_CONTEXT_STACK32
{
    ULONG ActiveFrame;                                                      //0x0
    struct LIST_ENTRY32 FrameListCache;                                     //0x4
    ULONG Flags;                                                            //0xc
    ULONG NextCookieSequenceNumber;                                         //0x10
    ULONG StackId;                                                          //0x14
};