The European Democrat Union (EDU) is one of the three European wings of the International Democrat Union, along with the European People's Party (EPP) and the Alliance of European Conservatives and Reformists (AECR). Its members include Christian democratic, liberal conservative, and conservative political parties. It is only a nominal sub-entity of the IDU, since it ceased its activities in 2002.
EDU members include only Christian democratic, liberal conservative, and conservative political parties.
The text says EDU "members include Christian democratic, liberal conservative, and conservative political parties' but it doesn't say it exclusively includes these members and no others or that it includes these and others, which the algorithm seems to have assumed.