graph G { Guido -- Iznogood; Guido -- Floris; Guido -- Guus; Guido -- Unknown; Iznogood -- Laurent; Iznogood -- JeanEtienne; Guido -- JeanEtienne; Guido -- John; Unknown -- Gunter; Guido -- Doris; Iznogood -- Joseph; Guus -- Joseph; Guus -- Unknown; John -- Doris; Joseph -- John; Gunter -- Floris; Floris -- Doris; }