 \left\{ \begin{array} { l } { e _ { 1 } ^ { \sharp } ( x ) = e _ { 2 } ^ { \sharp } ( x ) = 0 } \\ { e _ { 3 } ( x ) = e _ { 4 } ( x ) = 0 \; . } \\ \end{array} \right.  \coyote\hippo\whale \whale \dolphin