Display those choices that are not selected in a select multiple question previously

User Support Form Building
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1

Dear Colleagues,
I need to put a skip logic for below question.

Example:

  1. What did you buy (Multiple CHOICE):
    a. car
    b. pen
    c. bike
    d. book

  2. If you did not buy, what is the reason? (Here I want this question to appear only if any of the above is UNCHECKED.

Thanks