
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
Given the sequence

$$
\frac{1}{1} ; \frac{2}{1} ; \frac{1}{2} ; \frac{3}{1} ; \frac{2}{2} ; \frac{1}{3} ; \frac{4}{1} ; \frac{3}{2} ; \frac{2}{3} ; \frac{1}{4} ; \ldots
$$

At what position in this sequence is the number $\frac{2021}{2019}$?

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