name = 'capital/2' slug = 'capitals' description = '''\
capital(X, Y): Y is the capital city of country X.
capital(X, Y)
Y
X
?- capital('Ireland', Y). Y = 'Dublin'.
Useful facts are given as country(Name, ID, Capital, CapitalProvince, Size, Population).
country(Name, ID, Capital, CapitalProvince, Size, Population)