Describe the language generated by the grammar G $=\{\backslash$Sigma $,,$ S$,\backslash$Pi $\},$ where $\backslash$Sigma $=\{0,1\},=\{$S$,$X$,$Y$,$Z$\}$

and

$\backslash$Pi $=\{$S$->0$X$|1$Y$,$X$->1$Y$|1$Z$,$Y $->0$X$|0$Z$,$Z$->0|\backslash$epsi $\}.$