In the figure,what represents a saddle joint? 
Definitions:
Overregularization
A linguistic phenomenon observed in language learning children where they apply grammatical rules too widely, leading to errors.
Lexical Analysis
The process of converting a sequence of characters into a sequence of tokens, typically in the context of programming languages.
Creative Intelligence
The capability to create output that is simultaneously original (innovative, surprising) and suitable (beneficial, adaptable in relation to the limitations of the task).
Practical Intelligence
The ability to solve everyday problems by utilizing knowledge gained from experience in order to effectively deal with challenges and adapt to one's environment.
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