
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
Agatha wrote a twenty-digit number 12345678901234567890. Filip selected four digits from Agatha's number that were written consecutively. He tried arranging these four digits in different orders and eventually succeeded in forming a pair of two-digit numbers, where the first number was 1 greater than the second.

Which pairs of numbers could Filip have formed? List all possible pairs.

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