There are two principal methods used to generate random numbers.

The diners included five special guests, representing the principal methods of ballet training in use at that time.

With these principal methods he opened the path to systematic research on terpenes.

These are two principal methods by which the effect of armature reaction is overcome.

The opening of packages was the principal culinary method.

Its main focus is deeply rooted in preserving the principal technical methods of fine manual work.

Love is declared to be the "principal method of knowledge and action" for the artists.

The principal methods used for governing are described below.

There are two principal methods of dealing with this.

Again, there are two principal methods of dealing with this contingency.