why ${0} is valid but ${0 is not valid?
it means that curly braces evaluate what's inside them and that's why we
cannot have ${0?
variables shouldn't start from 0 so it means that it started from braces?
if yes why I cannot have ${0? and what is the variable here finally? $0 is
what it interprets? if yes so it is not a legal variable
I am totally mixed up.
Sincerely
Negin Nickparsa
