Consider the following jumbled sentences derived from a coherent academic paragraph: I. Consequently, modern computational linguistics has shifted toward statistical corpus-based models that analyze massive text repositories for probabilistic patterns. II. Traditional rule-based grammar systems often failed to account for the fluid, context-dependent nature of natural human communication. III. This paradigm shift has fundamentally revolutionized machine translation, automated sentiment analysis, and conversational AI agents. IV. Early attempts at machine translation relied heavily on manually coded syntactic rules and bilingual dictionaries, which proved computationally fragile when encountering idioms or syntactic ambiguity. Identify the logical sequence that forms a cohesive and unified paragraph.

To determine the correct logical sequence, we must analyze the thematic progression and cohesive ties (such as transitions and demonstrative pronouns). Sentence II introduces the core problem: traditional rule-based grammar systems failed to capture context-dependent communication. Sentence IV immediately follows by giving specific historical evidence of this failure ('Early attempts at machine translation relied heavily on manually coded syntactic rules... which proved computationally fragile'). Sentence I presents the natural consequence and transition from this failure ('Consequently, modern computational linguistics has shifted toward statistical corpus-based models'). Finally, Sentence III concludes the paragraph by highlighting the broad impacts of this shift ('This paradigm shift has fundamentally revolutionized...'). Thus, the coherent sequence is II - IV - I - III. For further reading on textual cohesion and syntactic arrangement, consult Sentence structure.