
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
Xiaoming needs to get four cows across a river, where the time each cow takes to cross is 5 minutes, 7 minutes, 9 minutes, and 11 minutes, respectively. However, the river can only accommodate two cows crossing at the same time. What is the minimum time, in minutes, to get all four cows across the river?

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