Name the pairs of countries with the 50 longest and shortest land borders. Border lengths are total length of those countries’ borders, not lengths of individual segments. Dependent territories are included as part of the main country (answer the name of the country which claims it). Any border across land is included, including artificial land. Bridges/tunnels are excluded. Use the following abbreviations for these four countries: US, UK, DRC & CAR. Answer by typing in both countries in either order (i.e. ‘FranceGermany’ or ‘AustriaCzech’).