“to abut” is largely present (22%) in B6, due to the presence of several walls which are quite high (2-3 meters) and extended, visible for more than 1000 years, implying a large quantity of layers in contact with them.
“to bond with” takes a small quantity between the verbs. Its presence is due to some cases of walls which consist of several parts: one example is ^wall6, which is made of several distinguishable elements all built in the same time.