mhbd
      mhsd                     mhsd
          mhlt                     mhlp
             mhit                     mhyp       mhyp
                 mhod string              mhip        mhip    
                 mhod string              mhip        mhip    
             mhit     
                 mhod string              mhip        mhip    
                 mhod string              
             mhit
                 mhod string

Figure 4: Header structure flow.

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