Low whistle grip" may be required due to the distance between the holes. They belong to the same woodwind instrument family of end-blown fipple flutes. Though the tone of this instrument varies subtly among makers, low whistles are generally characterised by a more breathy, flute-like sound than traditional tin whistles. While the precise history of the low whistle is often debated, it is known that various kinds of vertical fipple flutes have existed in antiquity. The fipple flutes developed during the 16th century were the ancestors of today's low whistle, carrying through from early transverse flutes the six-holed design tradition and conical
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