16. The apparatus as recited in claim 12 , wherein generating the one or more annotated alternative versions of the input annotated phrase, the processor and the memory, with the computer code instructions, are further configured to cause the apparatus to apply one or more transformation rules to nodes of the syntactic tree.
18. The apparatus as recited in claim 16 , wherein applying one or more transformation rules to nodes of the syntactic tree, the processor and the memory, with the computer code instructions, are further configured to cause the apparatus to omit an expression of the input annotated phrase within an alternative version of the one or more annotated alternative versions generated, the expression associated with a node of the syntactic tree generated.