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A045615
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Genus 0 subgroups of PSL(2,Z) up to conjugacy - by level.
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0
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1, 3, 4, 7, 8, 12, 11, 18, 10, 7, 2, 11, 3, 4, 4, 9, 0, 6, 0, 1, 2, 0, 0, 1, 2, 1, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
(list; graph; refs; listen; history; internal format)
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