Fix typo error that breaks the :require directive
Vni: now contains only lowercase combinations
- duplicate entries

This entries will be duplicated bc they can be genereated from
the lowercase form (by using the script "upcase.rb")
- Remove all shortcuts that start by 7

This is something like "w" in Telex: it will cause some problem
with the script "upcase".

We may need to add these combinations later
find-missing accepts VNI modifiers
vn: + missing entries and "a6"

For some reaons, the defintion of "a6" (aa) is missing
vni: - non-sense combinations
- non-sense combinations
Fix typo