Analyze the sentence 'I saw the man with the telescope' from a computational linguistics perspective. Identify the structural ambiguity (Prepositional Phrase attachment) and explain how a probabilistic parser might determine the correct parse tree based on corpus data. Compare this with the challenges of resolving ambiguity in 'The trophy doesn't fit into the brown suitcase because it is too [large/small]'. Describe the knowledge representation methods (e.g., WordNet, FrameNet) required for a system to understand the semantic roles and resolve the pronoun reference (coreference resolution) correctly.