
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
A ray $l_1$ is emitted from point M(-1, 3) to the x-axis, and is reflected at point P(1, 0) on the x-axis, resulting in ray $l_2$. Ray $l_2$ is then reflected by the line $x+y-4=0$, resulting in ray $l_3$. Find the equations of $l_2$ and $l_3$.

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