Which are the countries dual citizenship exists in?

Australia, Barbados, Belgium, Bangladesh, Canada, Cyprus, United States, United Kingdom, Switzerland, South Korea, South Africa (requires permission) , Egypt(requires prior permission), Greece, France, Finland, Germany (requires prior permission), Iraq, Italy, Israel, Ireland, Hungary, Iceland, Sweden, Slovenia, Syria, Serbia, Armenia, Lebanon, Malta, Spain ( allows only with certain Latin American countries), Tonga, Philippines, Sierra Leone, Sri Lanka (by retention), Pakistan (accepts only with 16 countries), Portugal, Turkey (requires permission)

France.