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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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