The USB bus allows seven cascading tiers of ports. They are divided into three main tiers. The western facade is divided into four vertical tiers. Fondant is a form of frosting style that is rolled out and draped over tiers. The nests contain multiple, horizontal tiers of combs within. Spectator seats are distributed on two tiers, totally covered. The songs are grouped by difficulty into named tiers. Unmanned machines clean the top 27 additional tiers and the glass spire. The HEVC standard defines two tiers, Main and High, and thirteen levels. This vertical model is further divided into levels called tiers. These weapons are classified into different tiers and rarity. The hall seats 2,955, divided among three tiers. There are two paid membership tiers. There were three imeem VIP subscription tiers. MAX Data has two different licensing tiers&colon; Basic and Advanced.