#include ../data/case14.txt
#include ../lib/idx_gen.txt
#include ../lib/idx_bus.txt
#include ../lib/idx_brch.txt
#include ../lib/ext2int.txt

i2e = ext2int(bus, gen, branch, areas);

assert_relative_eq(i2e, [
    [1],
    [2],
    [3],
    [4],
    [5],
    [6],
    [7],
    [8],
    [9],
    [10],
    [11],
    [12],
    [13],
    [14]
]);