TriC2Basis.h

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basis[0] = (rr + ss - 1.0) * (2.0 * rr + 2.0 * ss - 1.0);
basis[1] = rr * (2.0 * rr - 1.0);
basis[2] = ss * (2.0 * ss - 1.0);
basis[3] = -4.0 * rr * (rr + ss - 1.0);
basis[4] = 4.0 * rr * ss;
basis[5] = -4.0 * ss * (rr + ss - 1.0);