Here, the Berkeley parser (solid blue edges) incorrectly attaches from debt to the noun phrase $ 30 billion whereas the correct attachment (dashed gold edges) is to the verb raising.
there are a range of error types, as shown in Figure 2 attachment ambiguity where by yesterday afternoon should attach to had already, (b) is an NP-internal ambiguity where half a should attach to dozen and not to newspapers, and (c) is an adverb attachment ambiguity, where just should modify fine and not the verb 's.