M = A + 1I
Clebsch graph: 
16
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M22 graph: 
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Gewirtz graph: 
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HS graph: 
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M = A + 2I
Clebsch graph: 
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M22 graph: 
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HS graph: 
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M = A + 3I
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M22 graph: 
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Gewirtz graph: 
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HS graph: 
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M = A + 4I
Clebsch graph: 
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M22 graph: 
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