
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
There are four bus routes in a town:
- Route 1 goes C-D-E-F-G-H-C and is 17 km long.
- Route 2 goes A-B-C-F-G-H-A and is 12 km long.
- Route 3 goes A-B-C-D-E-F-G-H-A and is 20 km long.
- Route 4 goes C-F-G-H-C.

How long is Route 4?

A) 10 km
B) 9 km
C) 8 km
D) 7 km
E) 6 km

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