
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
Given the sequences $\{a_n\}$ and $\{b_n\}$ such that $a_1 = -1$, $b_1 = 2$, and the recurrence relations $a_{n+1} = -b_n$, $b_{n+1} = 2a_n - 3b_n$ for $n \in \mathbf{N}^*$, find the value of $b_{2015} + b_{2016}$.

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