Some questions

To start, please load the new knowledge base by doing

library(countries).

Now try some questions. Can you:

• Ask a question to find the capital of bulgaria. Remember that all names of things are in lower case, even though in English, they would begin with a capital letter.

• Ask which country has capital vaduz.

• Find on which river vaduz lies.

• Find which countries adjoin the irish_sea.

• Find which countries have exactly the same name as their capitals.

Was this knowledge base written before or after German unification? Before or after Berlin became capital? Before or after the breakup of the USSR?