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$$ \left\{ \begin{array}{l l} \dot {u} = u _ {0} + \frac {1}{2} \dot {x} _ {0} ^ {2} \\ \dot {v} = v _ {0} - \frac {1}{2} \dot {x} _ {0} ^ {2} \end{array} \right. $$
$$ \therefore $$
$$ \left. \begin{array}{l l l l} \frac {1}{2} & \frac {1}{2} & \frac {1}{2} & - \\ \frac {1}{2} & \frac {1}{2} & \frac {1}{2} & \frac {1}{2} \end{array} \right\} $$
$$ \left. \rho_ {i} \right\rvert \left. \rho_ {j} \right\rvert \left. \rho_ {k} \right\rvert \dots $$
$$ \dot {x} \dot {y} \dot {z} \dot {w} \dot {u} \dot {v} \dot {w} \dot {x} \dot {y} \dot {z} - $$
$$ \therefore \dot {n} \dot {s} \dot {s} \dot {s} \dot {s} \dot {s} \dot {s} \dot {s} \dot {s} \dot {s} $$
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BEAC
$$ \ddot {a} _ {i j k l} \dot {a} _ {l a b} \dot {a} _ {j l k} \dot {a} _ {k l i} \dots \dot {a} _ {k l l} $$
$$ : \therefore \text {i} \leq \text {j} \leq \text {a} \quad \text {i} \leq \text {j} \leq \text {a} \quad \text {i} \leq \text {j} \leq \text {a} \quad \text {i} \leq \text {j} \leq \text {a} \quad \text {i} \leq \text {j} \leq \text {a} $$
$$ \begin{array}{l} \text {e l s e} \end{array} $$
$$ \therefore \mathrm {g} \mathrm {d} \mathrm {l} \mathrm {a d} \mathrm {d} \mathrm {l} $$
$$ \therefore \mathrm {a l l} \mathrm {j} \mathrm {j} \mathrm {j} \mathrm {j} \mathrm {j} \mathrm {j} \mathrm {j} \mathrm {j} \mathrm {j} \mathrm {j} \mathrm {j} \mathrm {j} \mathrm {j} \mathrm {j} \mathrm {j} \mathrm {j} \mathrm {j} \mathrm {j} \mathrm {j} \mathrm {j} \mathrm {i} \mathrm {i} \mathrm {i} \mathrm {i} \mathrm {i} $$
$$ \therefore \frac {1}{2} \frac {1}{2} \frac {1}{2} \frac {1}{2} \frac {1}{2} \frac {1}{2} \frac {1}{2} \frac {1}{2} \frac {1}{2} \frac {1}{2} \frac {1}{2} \frac {1}{2} \frac {1}{2} \frac {1}{2} \frac {1}{2} \dots $$
$$