Why Machine Reading Comprehension Models Learn Shortcuts?

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Knowledge Triples

Source Entity	Relationship	Target Entity
Challenging Questions OtherEntity	analyzedBy	Learning Difficulty Method
Machine Reading Comprehension Task	evaluatedIn	Benchmark Datasets Material
Shortcut Questions OtherEntity	analyzedBy	Learning Difficulty Method
Synthetic Datasets Material	annotatedWith	Challenging Questions OtherEntity
Synthetic Datasets Material	annotatedWith	Shortcut Questions OtherEntity