$\begin{array}{l}a=0.1\\ b=0.2\\ c=0.1\end{array}$ $\begin{array}{l}{x}_{12}=\frac{-0.2±\sqrt{-0.76}}{4}\\ {x}_{21}=\frac{-0.2±\sqrt{-0.76}}{4}\end{array}$ −0.05 −0.05 0.168 −1.07 Spiral Spiral Saddle Spiral Asymptotically stable Asymptotically stable Unstable Stable $\begin{array}{l}a=0.6\\ b=0.3\\ c=0.5\end{array}$ $\begin{array}{l}{x}_{12}=\frac{-0.2±\sqrt{-4.71}}{4}\\ {x}_{21}=\frac{-0.2±\sqrt{4.71}}{4}\end{array}$ −0.0075 −0.0075 0.468 −0.618 Spiral Spiral Saddle Spiral Asymptotically stable Asymptotically stable Unstable Stable $\begin{array}{l}a=0.01\\ b=0.02\\ c=0.03\end{array}$ $\begin{array}{l}{x}_{12}=\frac{-0.2±\sqrt{-0.0796}}{4}\\ {x}_{21}=\frac{-0.2±\sqrt{0.0796}}{4}\end{array}$ −0.02 −0.02 0.066 −0.076 Spiral Spiral Saddle Spiral Asymptotically stable Asymptotically stable Unstable Stable $\begin{array}{l}a=0.2\\ b=0.2\\ c=0.03\end{array}$ $\begin{array}{l}{x}_{12}=\frac{-0.2±\sqrt{-1.56}}{4}\\ {x}_{21}=\frac{-0.2±\sqrt{1.56}}{4}\end{array}$ −0.2 −0.2 0.262 −0.362 Spiral Spiral Saddle Spiral Asymptotically stable Asymptotically stable Unstable Stable