
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 string of digits is formed by writing natural numbers in order from left to right: 123456789101112131415...... In this string, the combination "5678" first appears from the 5th to the 8th position, and the combination "0111" first appears from the 11th to the 14th position. Determine which four-digit combination appears the latest in this sequence.

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