Hermes, the Greek God of Speed, has created a two-dimensional colony Massilia in space. The colony, consisting of one or more provinces, can be represented by a linear equation in 3-dimensional space. In each province there are 3 or 4 cities, each being on their convex hull. Now, citizens of each province want to create road network connecting cities of their own province. Unfortunately, materials for road construction are not available in the colony, and can only be transported from Earth. Total material required to construct the roads will be proportional to their length. This is why they are interested to build road networks of shortest length connecting different cities of a province. In order to minimize length of each network they are also ready to make junctions away from cities, if so required.
Unfortunately creatures of the colony are pretty weak in mathematics and algorithms. They have, therefore, decided to take services of homo sapiens of earth, who are believed to be good in mathematics and algorithms. Accordingly the chief of Massilia sent an email to Academy of Computers and Mathematics(ACM) with Head Quarters at Dhaka to solve the problem. ACM has now asked you to help out our friends in Massilia.