Tin whistle of which tone holes the player should cover. The most common format is a vertical column of six circles, with holes to be covered for a given note shown filled with black, and a plus sign (+) at the top for notes in the second octave. Tablature is most commonly found in tutorial books for beginners. The tonic solfa is found in Ireland and possibly Wales, especially in schools. Many schools have printed sheets with tunes notated in tonic solfa, although in Ireland more have teaching by note. With the availability of good standard notation tutor books, teaching is possibly
Finger search in rank. If "x" and "y" are the "i"th and "j"th largest elements in the structure, then the difference in rank is |"i" - "j"|. If a normal search in some structure would normally take O(f("n")) time, then a finger search for "x" with finger "y" should ideally take O(f("d")) time. Remark that since "d" ≤ "n", it follows that in the worst case, finger search is only as bad as normal search. However, in practice these degenerate finger searches do more work than normal searches. For instance, if f("n") is log("n"), and finger search does twice as many comparisons