Hi,

Given matrix A of 4 cols.

1 a 0 4
1 b 5 8
2 a 0 3
2 b 4 7

I have another matrix B of 3 cols. How to assign (a or b) to the rows such
that in each row its 1st value must match the 1st col. of A, 2nd and 3rd
values must lie between 3rd and 4rd cols (inclusive) of A

1 2 3 -> a
2 4 5 -> b
2 0 3 -> a
1 7 8 -> b

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