
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 person walks 378 li, the first day he walks briskly, but starting from the second day, due to foot pain, each day he walks half the distance of the previous day, and arrives at the destination after 6 days. Calculate the difference in the distance walked on the fourth day and the sixth day.

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