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Does anyone know why Xichong dialect in Sichuan is different from Sichuan dialect?

It is normal that the accents of the three major districts in Sichuan (Ba Culture District, Shu Culture District and Panxi Culture District) are all different, and they are all Sichuanese, but I can't understand Neijiang's accent. It is best to know Panzhihua, because he is an immigrant city, so his accent is close to Mandarin.