The variety of complete pairs of zero-dimensional subschemes of length 2 of a smooth three-dimensional variety is singular

Equations are obtained that are satisfied by the vectors of the tangent space to the variety $X_{22}$ of complete pairs of zero-dimensional subschemes of length 2 of a smooth three-dimensional projective algebraic variety at the most special point of the variety $X_{22}$. It is proved that the system of equations obtained is complete and the variety $X_{22}$ is singular.