
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
Five volunteers, including A and B, are assigned to different positions at the China Pavilion, the UK Pavilion, the Australia Pavilion, and the Russia Pavilion at the Shanghai World Expo. Each position must be staffed by at least one volunteer. The total number of ways in which A and B can each independently take charge of a position is $\boxed{\text{number}}$. (Answer with a number)

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