summary of distinct values

hi.
i'm looking for formulas that do as following:
1. dynamically adding distinct values from a column (col D based on col A)
2. sumamrize all the values of the distinct occurrances (based on col B)
3. summarize the total values of the summarized column

all should be working dynamically.
i have something that works but it is very slow as i add values to the raw data (the recalculating process).
I'm looking for something more efficient and fast.
10x.

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