Absence Singles

Classification
Singles
Place Notation
3.3.3.1.3.1.1.1.3.1.3.3,1
Lead Head
231 (Code: z)
Symmetry
Palindromic
Hunt Bells
None
Lengths
24 rows per lead
72 rows per course (3 leads)
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Numbers
Grid
Data Source and Copyright
Details on the about page.