
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]


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A curious historian is hosting a puzzle where participants must guess the year a certain artifact was discovered. The year is made up of the six digits 1, 1, 1, 5, 8, and 9, and the year must start with an even digit. How many different possibilities are there for the artifact's discovery year?

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