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$${ \begin{array}{llll} \mbox{Dirac Theory} & \nearrow {\mbox {Spin orbit coupling }}\searrow & \mbox{Fine Structure} \\ &\searrow {\mbox{Relativistic variation of mass}} \nearrow \end{array}} $$ 

  $\nearrow$ Spin Orbit Coupling $\searrow$  
Dirac Theory       Fine Structure
  $\searrow$   Relativistic Variation of Mass   $\nearrow$  

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