 For example, the Pythagorean major third on C is C−E0 while the just major third is C−E−1.An extension of this Pythagorean-based notation to higher primes is the "Helmholtz / Ellis / Wolf / Monzo system" of ASCII symbols and prime-factor-power vectors described in Monzo's "Tonalsoft Encyclopaedia".While these systems allow precise indication of intervals and pitches in print, more recently some composers have been developing notation methods for Just Intonation using the conventional five-line staff.