pick states

>>

Creating a branch of states, as well as a new cursor:

(comp-x (>> states branch-key) p1 p2)

Notice that the structure of states is a tree of data and cursor:

{:cursor [:a]
 :data {}}

 :b {:data {}
     :c {:data {}}}

When (>> states :b) is evaluated, new piece of data is generated:

{:cursor [:a :b]
 :c {:data {}}}

In an older version, cursor and states are two separated variables, but now combined for convenience.