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Continue to ChatOn suborbital graphs for the modular group - https://avesis.ktu.edu.tr/yayin/60ea5095-7cfa-4741-86ad-f023c454bef2/on-suborbital-graphs-for-the-modular-group
On suborbital graphs for the modular group - https://avesis.ktu.edu.tr/yayin/60ea5095-7cfa-4741-86ad-f023c454bef2/on-suborbital-graphs-for-the-modular-group