
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
Let ellipse $E$ be defined by the equation $\dfrac {x^{2}}{a^{2}}+ \dfrac {y^{2}}{8-a^{2}}=1$ $(a > 0)$, with its foci on the $x$-axis, and the focal distance of ellipse $E$ is $4$.  
(I) Find the standard equation of ellipse $E$;  
(II) A line $l$ with an inclination angle of $\dfrac {5\pi}{6}$ passes through a point $M(m,0)$ $(m > a)$ outside the ellipse and intersects the ellipse at points $C$ and $D$. If the right focus $F$ of ellipse $E$ is inside the circle with chord $CD$ as its diameter, find the range of the real number $m$.

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