Rudiments according to the Percussive Arts Society. There may be as many as 1,000 distinct rudiments worldwide, but these 40 are the current American standards, referred to as “international” because they mix rudiments traditionally used in Anglo-American drumming with several drawn from the Swiss Basel drumming tradition. They were compiled by a committee led by Jay Wanamaker in 1984 that also happened to include William F. Ludwig Jr., son of the founder of NARD in 1933. The single-stroke roll consists of alternating sticking (i.e., RLRL, etc.) of indeterminate speed and length. There are 10 official variants of the double-stroke roll. In 1984, the Percussive Arts Society added 14 more rudiments to extend the list to the current 40 International Snare Drum Rudiments. The ordering was completely changed during this last re-organization. A hybrid drum rudiment is when two rudiments are combined into one rudiment. For example, the PAS #30 Flam Drag is a simple hybrid combining the traditional PAS rudiments #20 Flam and #31 Drag. A hybrid can also be created by adding a prefix before a rudiment or a suffix at the end of the rudiment in the form of extra notes or a rudimental pattern. There are certain characteristics that make a reasonable hybrid rudiment;   A few examples are the "Herta" which is a drag played with alternating sticking; the "cheese", a diddle with a grace note; and the "eggbeater", a five-tuplet with the sticking "rrrll." These hybrids have themselves given way to further hybrids; the "cheese invert" (an inverted flam tap with cheeses instead of flams) and the "diddle-egg-five" (a paradiddle-diddle followed by an eggbeater and two diddles, one on each hand). Other hybrid rudiments include: "book reports", "ninjas", and "flam dragons" (formerly known as "double flam drags"). Hybrid rudiments have been historically associated with modern marching band repertoire, especially Drum Corps International. The number of hybrid rudiments expanded rapidly starting in the 1990s. Today there are an indeterminate number, with more than 500 published and documented hybrid rudiments or unique variations. The latest innovation in hybrid rudiments has been "The Grid", which is a method for producing variations on a simple rudimental pattern by moving the individual elements of the rudiment (for example flams, accents, or diddles) through the notes of basic rhythm of the rudiment.