Mozart: Sonata in B-flat major, K. 333, I, mm. 23-38
In these selected measures, I feel that there are two periods. The periods are both eight measures long, making it symmetrical (same number of measures). The first two measure of both are very parallel, but from there on out, the second eight bars change from the original eight measures. I believe they are parallel periods, which means that the musical content of the periods are generally the same. Although at first it may look very different, eighth notes and all, it is a parallel symmetrical double period. There is a possible IAC in measure 26, and in measures 30 and 31 is the location of the cadence which ends this period. The cadence is a HC.
The second period begins just the same as the first did, but with a little less texture in the bass clef. Here Mozart experiments with new rhythms but keeping a similar note pattern. As the sixteenth notes become more and more common, and the non-chord tones are becoming more frequent I started to look at this section more as an emotion builder. These periods build their way back up, first having a IAC in meausure 35 and then to end with a PAC.
The HC formed a link to help the piece return to the same type of period again, while the PAC continues the eighth note runs which take you into the next period.