to clean takeoffs and landings". Pair skaters perform two types of jumps: side-by-side jumps, in which jumps are accomplished side by side and in unison, and throw jumps, in which the woman performs the jump when assisted and propelled by her partner. Euler The Euler is an edge jump. It was known as the half-loop jump in International Skating Union (ISU) regulations prior to the 2018–2019 season, when the name was changed. In Europe, the Euler is also called the Thorén jump, after its inventor, Swedish figure skater Per Thorén. The Euler is executed when a skater takes off from the back outside edge of one skate and lands on the opposite foot and edge. It is most commonly done prior to the third jump during a three-jump combination, and serves as a way to put a skater on the correct edge in order to attempt a Salchow jump or a flip jump. It can be accomplished only as a single jump. The Euler has a base point value of 0.50 points, when used in combination between two listed jumps, and also becomes a listed jump. Toe loop The toe loop jump is the simplest jump in figure skating. It was invented in the 1920s by American professional figure skater Bruce Mapes. In competition the base value of a single toe loop is 0.40; the base value of a double toe loop is 1.30; the base value of a triple toe loop is 4.20; and the base value of a quadruple toe loop is 9.50. The toe loop is considered the simplest jump because not only do skaters use their toe-picks to execute it, their hips are already facing the direction in which they will rotate. The toe loop is the easier jump to add multiple rotations to because the toe-assisted takeoff adds power to the jump and because a skater can turn his or her body towards the assisting foot at takeoff, which slightly reduces the rotation needed in the air. It is often added to more difficult jumps during combinations, and is the most common second jump performed in combinations. It is also the most commonly attempted jump, as well as "the most commonly cheated on take off jump", or a jump in which the first rotation starts on the ice rather than in the air. Adding a toe loop to combination jumps does not increase the difficulty