For example, if Root selects the NP in figure  1, then the f-structure corresponding to the S node is erased, giving figure 2 as a possible fragment: In addition the R o o t operation deletes from the remaining f-structure all semantic forms that are local to f-structures that correspond to erased c-structure nodes, and it thereby also maintains the fundamental two-way connection between words and meanings.
if Root selects the VP node so that the NP is erased, the subject semantic form "Kim" is also deleted:  As with Tree-DOP, the Frontier operation then selects a set of frontier nodes and deletes all subtrees they dominate.