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//0x20 bytes (sizeof)
struct _LOCK_HEADER
{
    struct _RTL_AVL_TREE LockTree;                                          //0x0
    struct _RTL_AVL_TREE LockMdlSwitchedTree;                               //0x8
    ULONGLONG Count;                                                        //0x10
    volatile LONG Lock;                                                     //0x18
    ULONG Valid;                                                            //0x1c
};