240
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(lattice models) 
(Klein transformation) 

:<math>\phi_j = \sum_{k=1}^{j1}\left(\frac{1}{2} + S_{k}^{z}\right) = \sum_{k=1}^{j1} f_k^{\dagger}f_k</math>
== See also ==
* [[Klein transformation]]
* [[Sduality]]
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