Aaron, Bruce, Colin, and Dean are four men standing in a straight line, not necessarily in that order. The following is known about them:

1. Precisely one man is fair, handsome, and unscarred.
2. Two men who are not fair, are each standing next to Aaron.
3. Bruce is the only man standing next to exactly one handsome man.
4. Colin is the only man not standing next to exactly one scarred man.

Determine who is fair, handsome, and unscarred.