
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
The railway bureau has six high-speed trains to be divided into two groups of three trains each, with the constraint that trains G1 and G2 cannot be in the same group. Given that the group containing G1 departs first, determine the total number of different departure sequences for these six trains.

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