
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 $C: \frac{x^2}{a^2} + \frac{y^2}{b^2} = 1 (a > b > 0)$ with its right focus at $(\sqrt{3}, 0)$, and passing through the point $(-1, \frac{\sqrt{3}}{2})$. Point $M$ is on the $x$-axis, and the line $l$ passing through $M$ intersects the ellipse $C$ at points $A$ and $B$ (with point $A$ above the $x$-axis).

(I) Find the equation of the ellipse $C$;

(II) If $|AM| = 2|MB|$, and the line $l$ is tangent to the circle $O: x^2 + y^2 = \frac{4}{7}$ at point $N$, find the length of $|MN|$.

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