For each tripoint, you have to type the first three letters of the three countries in any order (eg ITAFRAGER would work for hypothetical France-Germany-Italy tripoint). Note: use ROC for Republic of Congo, DRC for Democratic Republic of Congo, CAR for Central African Republic
Data from http://en.wikipedia.org/wiki/List_of_tripoints; country names from 'Countries of the World Quiz'
Countries in tripoints listed in alphabetical order, tripoints listed in alphabetical order
As a hint you are shown the first letter of the first country; these are grouped together when the first country is the same