The Edoid family can be divided into four main groups of languages.
Eighty neutropenic infected mice were randomly assigned into four main groups (20 mice/group).
The criteria are classified into four main groups of technological, economical, environmental, and miscellaneous.
In their modern form, arguments about the causes and value of imperialism can be classified into four main groups.
The British government combined all these companies into four main groups in 1923 as an economy measure.
Emergency scenarios were separated into four main groups: (1) suit issues, (2) general physiological, (3) attacks and (4) others.
The Panthers had evolved into four main groups that emerged from the original Cetinje gang, with orders for robberies being placed with different teams.
By using Hierarchical cluster analysis (HCA), the tested polymers were categorized into four main groups with respect to their recognition ability.
There are several types of oscillators that can be classified into four main groups: resistance-capacitance oscillators, inductance-capacitance oscillators, crystal oscillators, and integrated circuit oscillators.
Each article was classified into four main groups, namely the type of the axiom, the application area, the method, and the evaluation type.
The Tor project team say its users fall into four main groups: normal people who want to keep their internet activities private from websites and advertisers; those concerned about cyberspying; and users evading censorship in certain parts of the world.
