split.In = hisay.Out
lower.In = split.OutLeft
upper.In = split.OutRight
zippr.In1 = lower.Out
zippr.In2 = upper.Out
prntr.In = zipp
becomes
+-----+
+----> |lower| ------+
+-----+ +---+-+ +-----+ +--v--+ +-----+
|hisay| ---> |split| |zippr| ---> |prntr|
+-----+ +---+-+ +-----+ +-----+
| +-----+ ^
+----> |upper| ------+
+-----+