the skater's change of foot will be counted. A spin combination must have at least "two different basic positions" and each position must have two revolutions, anywhere within the spin. Skaters earn the full value of a spin combination when they include all three basic positions. The number of revolutions in non-basic positions is included in the total number of revolutions, but changing to a non-basic position is not considered a change of position. The change of foot and change of position can be made at the same time or separately and can be performed as a jump or as a step-over movement. Non-basic positions are allowed during spins executed in one position or, for single skaters, during a flying spin. Single skaters earn more points for performing difficult entrances into and exits out of their spins. An entrance is defined as "the preparation immediately preceding a spin", and can include the spin's beginning phase. All entrances must have a "significant impact" on the spin's execution, balance, and control, and must be completed on the first spinning foot. The intended spin position must be achieved within the skater's first two revolutions and can be non-basic in spin combinations only. A regular backward entry is not considered a difficult entry. An exit is defined as "the last phase of the spin" and includes the phase immediately performed after the spin. A difficult exit is defined as any jump or movement that makes the exit significantly more difficult. It can include the phase immediately following the spin and must have a "significant impact" on the spin's execution, balance, and control. There are 11 categories of difficult solo spin variations. Step sequences Step sequences have been defined as "steps and turns in a pattern on the ice". The ISU requires that all step sequences are performed "according to the character of the music". A step sequence must have the following characteristics to earn the most points: the sequence must match the music; it must be performed effortlessly throughout the sequence, and have good energy, flow, and execution; and it must have deep edges and clean turns and steps. Also important but not required are the following characteristics: a sequence must have originality and creativity; the skater must have "excellent commitment and control" of his or her entire body; and the skater must have good acceleration and deceleration during the sequence. As of 2022,