It is the one we start off with, so we can call it our tone row.
We can change the tone row by playing it backwards.
This is most commonly seen with hexachords or 6 notes of a basic tone row.
Barraqué's use of tone rows in his work is quite distinctive.
The tone row chosen as the basis of the piece is called the prime series (P).
As early as 1913 he was experimenting with tone rows and serial organization.
Some tone rows have a high degree of internal organisation.
All 30 were based on the same tone row, but the works could hardly have been more different.
A closer look at the separation of the opening into the four registers reveals two additional tone rows.
Nevertheless, his actual use of the tone row did not follow standard practice.