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my %hash_defaults = ('a'=>0 , 'e'=>0 , 'i'=>0 , 'o'=>0 , 'u'=> 0,);
my %hash = %hash_defaults;
...

# Reinitialize
%hash = %hash_defaults;

while (...) {
    my %hash = ('a'=>0 , 'e'=>0 , 'i'=>0 , 'o'=>0 , 'u'=> 0,);
    ...
};

use vars '%hash';

...
};
... changes are forgotten