Jaiminīya (Talavakāra) Brāhmaṇa 2-7.226

They flourish precisely through faculty and vital power.
The midday [pavamāna] is sixteen-fold;
that makes thirty-two;
the anuṣṭubh has thirty-two syllables,
[thinking:] "Whatever desire is in the anuṣṭubh, may that be attained by us!"
There are three seventeen-fold pṛṣṭhas;
Prajāpati is seventeen-fold;
they flourish through Prajāpati himself.
The acchāvāka's is sixteen-fold;
the sixteen-fold is faculty and vital power;
they flourish precisely through faculty and vital power.
The ārbhava is sixteen-fold;
that makes thirty-two;
the anuṣṭubh has thirty-two syllables,
[thinking:] "Whatever desire is in the anuṣṭubh, may that be attained by us!"
The agniṣṭomasāman is twenty-one-fold;
twelve months, five seasons, these three worlds, and that yonder sun is the twenty-first;
they go to the same world as him; they ascend unto him.

Now this is for the youngest who desire supremacy.

Its bahiṣpavamāna is twenty-four-fold, being [normally] nine-fold (trivṛt).

Those who are youngest and desire supremacy should sacrifice with it.

In that the bahiṣpavamāna is twenty-four-fold, being [normally] nine-fold—the year consists of twenty-four half-months;

the year is supremacy and seniority, [thinking:] "May he who is supremacy and seniority lead us to supremacy and seniority!"