
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 ..., a, b, c, d, 0, 1, 1, 2, 3, 5, 8,..., where each term is the sum of the two terms to its left, find the value of a.

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