
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Definition: In the plane, the minimum distance from point $P$ to points on curve $\Gamma$ is called the distance from point $P$ to curve $\Gamma$. In the Cartesian coordinate system $xOy$, given circle $M$: $(x- \sqrt {2})^{2}+y^{2}=12$ and point $A(- \sqrt {2},0)$, the moving point $P$ has equal distances to circle $M$ and point $A$, and the trajectory of point $P$ is defined as curve $W$.  
(Ⅰ) Find the equation of curve $W$;  
(Ⅱ) A line $l$ (not coinciding with the coordinate axes) passing through the origin intersects curve $W$ at two distinct points $C$ and $D$. Point $E$ is on curve $W$, and $CE⊥CD$. Line $DE$ intersects the $x$-axis at point $F$. Let the slopes of lines $DE$ and $CF$ be $k_{1}$ and $k_{2}$, respectively. Find $\dfrac {k_{1}}{k_{2}}$.

Present the answer in LaTex format: \boxed{Your answer}
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