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The system has an elaborate way of dealing with adjacency pairs.
The system has an elaborate way of dealing with adjacency pairs by use of the theory of discourse obligations, whose role is to define expectations as to the intentions that a participant should form and aim at realising. Sub-dialogues can be handled as well. The hierarchical representation of goals allows for such behaviour. When the user initiates a sub-dialogue, the goal behind it will be inferred by the system and treated accordingly. That is, the sub-dialogue will be represented as a sub-goal.
See TRAINS dialogue example (Section 1.3.3); In [3] the user makes a suggestion, in [4] the system acknowledges the suggestion first (``OK'') and then points out the problematic issue, which is a sub-dialogue.
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