In early Medieval account books, the numbers 7, 8, 12, 13 were written in roman numerals as 'vij', 'viij', 'xij', 'xiij'. The trailing 'j' helped prevent a person from changing a 7 to an 8, or a 12 into a 13. (Or similarly, from misreading a 13 as a 12, etc.)
I thought that similarly numeral 6 was written as 'vj' and not as 'vi' but I haven't been able to find an example either way. Can anyone help me?
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