1. This passage follows on the heels of the "riff," which also references a row statement.
2. The only other "special effect" of the work, key clicks (marked + in the score), also perform a specific structural function. Key clicks mark portions of row segments that occur "early" or "late" at block boundaries, i.e., that begin in the previous block, or end in the following block. Only one key click of the five instances in the work does not perform this function: the key click in m.98 (Example 5), which sets up the p/pp tp aggregate and the work's climax, occurs not on the high D#6 as expected, but on C#5 (which was also emphasized in the preceding passage). One can read this anomalous key click as further emphasis of pc Db at a crucial structural point.
3. Babbitt appears to have relaxed strict relations between phrase 3 and the referenced array lyne in order to obtain rhythm and pc correspondences to the penultimate phrase.
4. The relative lengths of the hypothesized prelude (Phrases 1-2, 18 quarter notes) and postlude (5 quarter notes) very roughly match the proportions of the Tchaikovsky introduction and postlude (32 and 8 quarter notes).
End of footnotes