
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 that the plane unit vectors $\overrightarrow{{e}_{1}}$ and $\overrightarrow{{e}_{2}}$ satisfy $|2\overrightarrow{{e}_{1}}-\overrightarrow{{e}_{2}}|\leqslant \sqrt{2}$. Let $\overrightarrow{a}=\overrightarrow{{e}_{1}}+\overrightarrow{{e}_{2}}$, $\overrightarrow{b}=3\overrightarrow{{e}_{1}}+\overrightarrow{{e}_{2}}$. If the angle between vectors $\overrightarrow{a}$ and $\overrightarrow{b}$ is $\theta$, then the minimum value of $\cos^{2}\theta$ is ____.

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