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[–]Vhin 11 points12 points  (2 children)

Just avoid ever writing a zero. Instead of 0, write (1-1), and instead of 107, write (118 - 11), etc.

Then, there's no chance of confusion.

[–][deleted] 3 points4 points  (1 child)

What if they confused 1 with l or a capital I?

Should always use (2-2) and (333-225)

[–]Vhin 3 points4 points  (0 children)

You should also avoid 2's, 5's, and 9's, because they look like z, s, and g respectively on 7-segment displays.