Simplify the following text for a Grade 10 native English-speaking person.
Original: The group identifier code ( GIC ) number is 0 or 1 for English-speaking countries ; 2 for French-speaking countries ; 3 for German-speaking countries ; 4 for Japanese ; 5 for Russian , et cetera .
Simplified: The group identifier is a 1 to 5 digit number . The single digit group identifiers are : 0 or 1 for English-speaking countries ; 2 for French-speaking countries ; 3 for German-speaking countries ; 4 for Japan ; 5 for Russian-speaking countries , 7 for People 's Republic of China .