
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
Given the ellipse $\frac{x^2}{a^2} + \frac{y^2}{b^2} = 1 (a > b > 0)$, with one of its directrices being $x = -4$, and sharing the same focus as the parabola $y^2 = 8x$.

(Ⅰ) Find the equation of the ellipse.
(Ⅱ) Let point $P$ be the intersection of the ellipse's left directrix and the x-axis. A line $l$ passing through point $P$ intersects the ellipse at points $M$ and $N$. The midpoint of segment $MN$ falls within the quadrilateral region (inclusive of its boundary) formed by the two foci and two vertices of the minor axis of the ellipse. Determine the range of the slope values for line $l$.

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