Classify the cities based on whether they are located in Eritrea or Gabon.
Keren, Franceville, Asmara, Port-Gentil, Assab, Libreville
Eritrea - Asmara, Keren, Assab
Gabon - Libreville, Port-Gentil, Franceville
<START_INST>Classify the cities based on whether they are located in Eritrea or Gabon.
Keren, Franceville, Asmara, Port-Gentil, Assab, Libreville<END_INST><START_CTX><END_CTX><START_A>Eritrea - Asmara, Keren, Assab
Gabon - Libreville, Port-Gentil, Franceville<END_A>