X(Sl(Y,Z)) + Y(Si(Z, X)) + Sl(Z, [X,Y\) + si(Y, tt_[Z, x]) + si(x, 7t-[Y,z\) = o (1.50) for any X, Y, Z e T\q(M), as a consequence of (dSi)(X,Y,Z) = 0.
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