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<img src="https://tex.z-dn.net/?f=%20a_%7B3%7D%20%3D%202%20.%203%20%3D%206%20" />
<img src="https://tex.z-dn.net/?f=%20a_%7B4%7D%20%3D%202%20.%204%20%3D%208%20%20%20" />
<img src="https://tex.z-dn.net/?f=%20a_%7B5%7D%20%3D%202%20.%205%20%3D%2010%20" />
<img src="https://tex.z-dn.net/?f=%20a_%7B6%7D%20%3D%202%20.%206%20%3D%2012%20" />
<img src="https://tex.z-dn.net/?f=%20a_%7Bn%7D%20%3D%205%20.%20n%20" />
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