Please help with this

0Hi,02br
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00I am going to write several (perhaps more) sentences with the variable noun 'discussion'. I think the difference in countable and uncountable aspects of a variable noun can be looked as one being perceived as a whole pie that is boundless and the other as an actual slice of a pie that has a definite shape.02br
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00OK, I am going to give you some sentences and when you see them, please tell me which one is correct. Did I deal with the pizza thing properly? 02br
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00We had a great discussion on human rights issues. (Correct)02br
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00We had great discussion on human rights issues. (Not correct, you should have 'a' in front of great.)02br
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00We cannot let the day go by without having discussion on human rights issues. (Correct)02br
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00We cannot let the day go by without having a solid discussion on human rights issues. (Correct)02br
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00We cannot let the day go by without having a solid discusion on possible human rights problems in some of the third-world countries. (Correct) 0-