
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 that A and B can only take on the first three roles, and the other three volunteers (C, D, and E) can take on all four roles, calculate the total number of different selection schemes for four people from five volunteers.

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