The term 'arranges at intervals' can be summarized by the crossword solution 'staggers'. This term is used to describe the act of arranging or placing objects in a series of uneven intervals. It is often used to refer to the arrangement of objects in a line or sequence, such as when organizing a parade or setting up a row of chairs. Staggering can also be used to refer to the timing of events, such as when scheduling classes or meetings.