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- What's wrong with lexical items that have an empty semantics?
- Infinite loops, especially but not necessarily if the item is an auxiliary tree
- Difficulty constructing a polarity automaton - except maybe for pronouns if you enable the zero literal semantic items
- How do I use the paraphrase selection mechanism documented in A Symbolic Approach to Near-Deterministic Surface Realisation using Tree Adjoining Grammar?
A See the paraphrase selection part of the manual