% Factories
% factory id production_rate 
factory 0 6
factory 1 6

% Villages
% village id demand
village 5 10
village 6 10
village 7 10

% n id
node 2
node 3
node 4

road 0 1 2
road 0 2 4
road 0 3 4
road 1 2 3
road 1 4 3
road 2 3 5
road 4 3 3
road 4 5 1
road 4 6 5
road 2 6 4
road 2 7 1