
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
Xiao Wang is practicing computer programming. Among the exercises, there is a programming problem with the following requirements: it consists of six subprograms A, B, C, D, E, F, and the program B must be executed after program A, program C must be executed after program B, and program D must be executed immediately after program C. According to these requirements, Xiao Wang has several different programming methods. How many methods are there? (Express the result with a number.)

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