Each label of these four boxes provides a pop-up definition when you click and hold on it. Parent - The box directly above the name of the selected verb. Parent has the same definition as a ComeFrom. It's the list of possible verbs leading to the selected verb. Children - The box directly below the name of the selected verb.
Children has the same defintion as an Option.
It's the list of possible verbs resulting from the selected verb. Parents of Children - The box to the left of the selected verb. Parents of Children is the list of verbs that lead to the verbs in the Children box. Children of Parents is list of verbs that could result from the verbs in the Parents box. If you double-click on any verb listed in any of these four boxes, then that verb will become the selected verb, and all its links then appear.