private BigDecimal[] gauss(BigDecimal[][] A, BigDecimal[] B) {
		BigDecimal[] X = new BigDecimal[64];
		Arrays.fill(X, BigDecimal.ZERO);
		int n = 64;
		for (int j = 0; j < n; ++j) {
			int bestI = j;
			for (int i = j + 1; i < n; ++i)
				if (A[i][j].abs().compareTo(A[bestI][j].abs()) > 0) {
					bestI = i;
				}
			BigDecimal[] tm = A[j];
			A[j] = A[bestI];
			A[bestI] = tm;
			BigDecimal tmp = B[j];
			B[j] = B[bestI];
			B[bestI] = tmp;
			for (int i = j + 1; i < n; ++i) {
				BigDecimal d = A[i][j].divide(A[j][j], mc);
				for (int t = 0; t < n; ++t) {
					A[i][t] = A[i][t].subtract(A[j][t].multiply(d, mc), mc);
				}
				B[i] = B[i].subtract(B[j].multiply(d, mc), mc);
			}
		}
		for (int i = n - 1; i >= 0; --i) {
			for (int j = i + 1; j < n; ++j) {
				B[i] = B[i].subtract(A[i][j].multiply(X[j], mc), mc);
			}
			X[i] = B[i].divide(A[i][i], mc);
		}
		return X;
	}