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Continue to ChatClassification of normal subgroups of Hecke group H6 in terms of parabolic class number - https://avesis.uludag.edu.tr/yayin/84b378c7-9182-4e01-90ab-99703d3f4f5f/classification-of-normal-subgroups-of-hecke-group-h6-in-terms-of-parabolic-class-number