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I'm using the following data structure: x1a ← 2 1 ⍴ 1 0 x1b ← ⍬ x2a ← 2 2 ⍴ 1 1 0 0 x2b ← 2 1 ⍴ 1 0 x3a ← 1 2 ⍴ 1 0 x3b ← 1 q ← (x3a x3b) (x2a x2b) (x1a x1b) And attempting a row reduction equivalent to the following operations: output ← x3b + x3a +.× x2b + x2a +.× x1a I was thinking the...