Separability of Components

An idealized view of natural language processing has the components cleanly separated and sequential:


                     Lexicon
                    /       \ 
                   /         \ 
Sentence  -->   Syntax  -->   Semantics
                                |
                                V
                            Pragmatics
                                |
                                V
                              Output

Unfortunately, such a clean separation doesn't work well in practice.

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