
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

Four teams developed a coal field using open-pit mining for three years, with each team working at a constant productivity. In the second year, due to weather conditions, work was suspended for four months, and for the rest of the time, the teams worked in shifts (one team at a time). The ratio of the working times of the first, second, third, and fourth teams and the amount of coal extracted were as follows: in the first year, the ratio was 4:1:2:5 and 10 million tons; in the second year, the ratio was $2:3:2:1$ and 7 million tons; in the third year, the ratio was 5:2:1:4 and 14 million tons. How much coal would be extracted in 4 months if these four teams worked together?

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