second rule example 2

If X-some-Z and Y ---> Z I don't understand why we can't make the deduction X-some-Y. How does the explanation "we don't know how many Zs or Xs we have" matter in this situation? Isn't this also the case in the first example of Rule 2?

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sangagul1234ah@gmail.com January 17, 2021

Never mind. I got it.

I didn't think about the fact that we can't do Z--->Y

shunhe January 21, 2021

Glad you figured it out! Let us know if you have any further questions.