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AmbiguityWhen considering whether a set of sentence is consistent, we need to remember that sentences can be ambiguous.
There a two main types of ambiguity in a sentence: Lexical ambiguity occurs when a word in the sentence has more than one meaning. For example:
I know a bank. Structural ambiguity occurs when there is more than one way of taking the structure of the sentence; for instance when there is more than one way in which the words might be grouped.
A particular type of structural ambiguity occurs when there is ambiguity of cross-reference.
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