Identify the organizational method used in each of the following sets of main points.
Mardi Gras parades are lavish events that take place over the course of several weeks.
Mardi Gras costumes include disguises, medallions, and the colors purple, green, and gold.
Mardi Gras food features Cajun and Creole dishes common to southern Louisiana.

In ancient Rome, the Colosseum hosted gladiatorial games and other kinds of popular entertainment.
In the Middle Ages, the Colosseum was occupied by religious groups and used as a cemetery
In modern times, the Colosseum has been restored and turned into a tourist attraction.

Human trafficking is a widespread national problem.
The problem can be solved by a combination of national and international action.