It is said to be the only language with a numeral system based exclusively on five, although quinary systems exist.
2.
:: : I recall seeing quinary in a Stephen Jay Gould essay on an obselete system of catagorizing living beings in groups of five, known as the " Quinary System ".
3.
Friend also developed refinements to his quinary system, which included what he called " the Three A's of Anusara " ( attitude, alignment and action ), seven energy loops that comprise the human body, and various cues to assist in teaching.