
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
A sequence ${a_{n}}$ satisfies $a_{1}=1$ and $(a_{1}+a_{2})+(a_{2}+a_{3})+(a_{3}+a_{4})+…+(a_{n}+a_{n+1})=2^{n+1}-2$. Determine the value of $a_{8}$.

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