The diagram shows a rectangle with a line of symmetry at $$\(x=2\)$$. Two vertices of the rectangle are at $$\((-1,1)\)$$ and $$\((-1,4)\)$$. The shaded region is defined by the inequalities $$\(a \leqslant x \leqslant b\)$$ and $$\(c \leqslant y \leqslant d\)$$. Find the values of $$\(a, b, c\)$$ and $$\(d\)$$. $$\[ \begin{gathered} a= ................................................ \\ b= ................................................ \\ c= ................................................ \\ d= ................................................ \end{gathered} \]$$

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