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//0x18 bytes (sizeof)
struct _VACB
{
    VOID* BaseAddress;                                                      //0x0
    struct _SHARED_CACHE_MAP* SharedCacheMap;                               //0x4
    union
    {
        union _LARGE_INTEGER FileOffset;                                    //0x8
        USHORT ActiveCount;                                                 //0x8
    } Overlay;                                                              //0x8
    struct _LIST_ENTRY LruList;                                             //0x10
};