
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
Find the greatest common divisor (GCD) of the two numbers in (1) using the "subtraction method", and find the GCD of the two numbers in (2) using the "Euclidean algorithm".
(1) 72, 168;
(2) 98, 280.

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