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The left column of each row remains the same.
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An interesting thing to note here is that this looks like a reflection about the imaginary y-axis- so if they were to put an answer with a triangle with a vertical line thing I would have gotten this wrong. It’s just coincidental that a 90 degree rotation matches a y-axis mirror reflection for rows one and two! Awesome question!
The third column is the addition of columns one and two, where column two is rotated CW 90 degrees.