ok, in words get the weekly count whose (Tier value in 'Tier1' and group by clustercode whose count should be >=6)
means(for this week how many clustercode falls in tier1 should be >=6 than only count that as one document) and so on we need to add 3 different conditions with logical OR and get the distinct count.
X-axis=weekly
y-axis=counts based on above condition
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