$$\left. \begin{array} { l } { x y , z } \\ { y 00 ^ { \circ } } \\ { y / z ^ { - x ^ { 0 } } } \\ { z ^ { 0 } } \end{array} \right.$$
$xyy_{00}z$
$$xyy_{00}z$$
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$xy,\ z,\ y_{00},\ yz,\ 1$
