Several different types of delay systems were invented for this purpose, with one common principle being that the information was stored acoustically in a medium.

Under all forms of art, there lies a common principle.

With these two genres, it shares the common principle of player hierarchy.

But there are enough common principles and excellent advice here for anyone to give it a thorough reading.

Instead, they overlap, and share common principles -- principles of justice and progress; tolerance and the dignity of all human beings.