i'm actually stuck on all of it. no idea how to start/finish it.
Think of a single row of the matrixes, say, LLLL and RRRR; you want to take the first half of the first array and the second half of the second array; the result must be LLRR.
Now think of integer division: 4/2 == 2 and 5/2 == 2 as well.
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