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//0x3840 bytes (sizeof)
struct _HEAP_VAMGR_CTX
{
    struct _HEAP_VAMGR_VASPACE VaSpace;                                     //0x0
    ULONGLONG AllocatorLock;                                                //0x860
    ULONG AllocatorCount;                                                   //0x868
    struct _HEAP_VAMGR_ALLOCATOR Allocators[255];                           //0x870
};