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Continue to Chatsigma-core and I-core of bounded sequences - https://avesis.ankara.edu.tr/yayin/1beb3636-bef1-4a97-95e4-bd955a2f99ff/sigma-core-and-i-core-of-bounded-sequences
sigma-core and I-core of bounded sequences - https://avesis.ankara.edu.tr/yayin/1beb3636-bef1-4a97-95e4-bd955a2f99ff/sigma-core-and-i-core-of-bounded-sequences