
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
In the Cartesian coordinate system $(xOy)$, let the line $l: \begin{cases} x=2-t \\ y=2t \end{cases} (t \text{ is a parameter})$, and the curve $C_{1}: \begin{cases} x=2+2\cos \theta \\ y=2\sin \theta \end{cases} (\theta \text{ is a parameter})$. In the polar coordinate system with $O$ as the pole and the positive $x$-axis as the polar axis:

(1) Find the polar equations of $C_{1}$ and $l$:

(2) Let curve $C_{2}: \rho=4\sin\theta$. The curve $\theta=\alpha(\rho > 0, \frac{\pi}{4} < \alpha < \frac{\pi}{2})$ intersects with $C_{1}$ and $C_{2}$ at points $A$ and $B$, respectively. If the midpoint of segment $AB$ lies on line $l$, find $|AB|$.

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