An industrial facility is planning a network of 12 telemetry devices. They are evaluating two different network topologies as illustrated below:

1. A fully connected mesh topology (where every device is connected directly to every other device via a dedicated duplex cable).
2. A star topology (where all 12 devices are connected directly to a single central switch via dedicated duplex cables).

Let $M$ be the total number of physical cabling links required for the fully connected mesh topology, and $S$ be the total number of physical cabling links required for the star topology.

Calculate the difference $M-S$.