How can I write the following diagram: A to B to C and then I want an arrow from D to B where D is below B. The following code fix the B at the bottom but I want the reverse (the command \arrow(xx1--@bb) doesn't work)
I tried with this but idk what should I change. Also, how can I type a word over or below the arrow?
\schemestart A\arrow(aa--bb)B\arrow(--cc)C \arrow(@bb--xx1)X \schemestop