
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 point $P(2,2)$, circle $C$: $x^{2}+y^{2}-8y=0$, and a moving line $l$ passing through point $P$ intersects circle $C$ at points $A$ and $B$. Let $M$ be the midpoint of segment $AB$, and $O$ be the origin of the coordinate system. Find the trajectory equation of point $M$.

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