substract array elements based on other arrays
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I have three arrays.
The first one contain all numbrs that need to be studied, All = [1,2,3,4,5,6,7,8,9,10]
The other arrays contains the numbers that need to be retained, R1 = [8,9,10], R2 = 
I want the result to be (All - R1 - R2) which is equal to [1,2,3,4,6,7].
Your help is highly appreicated