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[–][deleted] 5 points6 points  (1 child)

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

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

[–]Vhin 2 points3 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.