Case study: Teleportors

An alien race has recently gifted a network of matter transporters

to the people of Earth. Matter transporters come in pairs,

corresponding to the two ends of a wormhole in space$-$time,

enabling nearly instant transportation between two distance

locations. Each of these pairs is referred to as a pont$-$to$-$point link.

The aliens have installed pairs of transporters in cities around the

world, creating a network that allows transportation between any

two cities in the network. The aliens have published a list of pairs

of cities joined by point$-$to$-$point links, in a CSV file like so:

Brisbane,Sydney

Vancouver,London

Paris,Brisbane

Paris,Vancouver

Sydney,Paris