
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 parabolic arch bridge, when the water level is 2m below the top of the bridge, the width of the water is 4m. If the water level drops by 1m, then calculate the width of the water.

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