
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
Let $A_{1}$, $A_{2}$, $A_{3}$, $\ldots$, $A_{7}$ be sets, each containing $2$ elements, and $A_{1}\cap A_{7}=\varnothing$, $A_{i}\cap A_{i+1}=\varnothing$ for $i=1,2,3,\ldots,6$. Let $B=A_{1}\cup A_{2}\cup A_{3}\cup \ldots \cup A_{7}$. Calculate the minimum number of elements in $B$.

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