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Using a unified and systematic scheme, the free field realization of
irreducible representations of osp$(2|2)$ is constructed. By using these
realizations, the correlation functions of $N=2$ superconformal model based on
osp$(2|2)$ symmetry and free field representation of
$\widehat{\text{osp}(2|2)}$
generators are calculated. Free field representation of curents are used to
determine the stress-energy tensor and the central charge of the model.
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