Letters in use in each phase. Less attested letters (1 to 2 times) are in grey colour. Frequently attested letters are shown in black on a grey background.
Legend: 1) Phase I. Chronology: first half 4th century B.C.-first half 6th century B.C. 2) Phase II. Chronology : second half 5th century B.C. 3) Phase III. Chronology: 4th century B.C. 4) Phase IV. Chronology: 4th-3rd century B.C. 5) Phase V. Chronology : 3rd century B.C. 6) Phase VI. Chronology: 3rd century B.C. (second half?) 7) Phase VII. Chronology: second half 3rd century B.C. – end 2nd century B.C.