2-category vs bicategory. 3-category vs tricategory.

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  1. What are the differences between "(strict or not) 2-category" or a "bicategory?"

  2. What are the differences between "(strict or not) 3-category" or a "tricategory?"

It seems that the 2-category contains bicategory, 3-category contains tricategory, but not the other way around. How to sharpen the statements?