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Var3: In our papers 2013--2018 we classified degenerations and Picardlattices of Kahlerian K3 surfaces with finite symplectic automorphism groups ofhigh order. For remaining groups of small order: $D_6$, $C_4$, $(C_2)^2$,$C_3$, $C_2$ and $C_1$ it was not completely considered. Cases of $D_6$ and$C_4$ were recently completely considered in [19] and [20]. Here we considerthe analogous complete classification for the group $(C_2)^2$ of the order 4.

Classification of degenerations and Picard lattices of Kahlerian K3 surfaces with the symplectic automorphism group (C_2)^2