 \draw (0,-.0) -- (0,.0); \draw (0,-.0) -- (0,.0); \draw (0,-.0) -- (0,.0); \draw (-0,-.0) -- (-0,.0); \draw (-0,-.0) -- (-0,.0); \draw (-0,-.0) -- (-0,.0); \node [below] at (0,-.0) {$0$}; \node [below] at (0,-.0) {$0$}; \node [below] at (0,-.0) {$0$}; \node [below] at (-0,-.0) {$-0$}; \node [below] at (-0,-.0) {$-0$}; \node [below] at (-0,-.0) {$-0$}; \