Mums are commonly divided into 13 categories, by flower description.
Professional training of veterinarians is commonly divided into two phases.
The planktonic graptolites are commonly divided into the Pacific and Atlantic (or European) provinces.
Rocks are commonly divided into three major classes according to the processes that resulted in their formation.
Texas is commonly divided into East and West, although the dividing line between the two is ambiguous.
The immense main hall on the fourth floor, which is commonly divided into rooms, has been opened up for an ambitious program of dance, music, and plays.
The Cenozoic, the most recent major interval of geologic time (i.e., the past 66 million years), is commonly divided into the Paleogene, Neogene, and Quaternary periods.
Soil organisms are commonly divided into five arbitrary groups according to size, the smallest of which are the protists including bacteria, actinomycetes, and algae.
In more-detailed classification schemes based on character of eruption, volcanic activity and volcanic areas are commonly divided into six major types, shown schematically in the diagram.
So-called physician extender services are commonly divided into nurse practitioners and physician's assistants, both of whom provide similar ancillary services for the general practitioner or specialist.
Computer printers are commonly divided into two general classes according to the way they produce images on paper: impact and nonimpact.
