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CHECK: [step 0] initial array
CHECK-NEXT: 1 1 1 1
CHECK-NEXT: 1 1 1 1
CHECK-NEXT: 1 1 1 1
CHECK-NEXT: [step 1] scan horizontally
CHECK-NEXT: 1 2 3 4
CHECK-NEXT: 1 2 3 4
CHECK-NEXT: 1 2 3 4
CHECK-NEXT: [step 2] transpose array
CHECK-NEXT: 1 1 1
CHECK-NEXT: 2 2 2
CHECK-NEXT: 3 3 3
CHECK-NEXT: 4 4 4
CHECK-NEXT: [step 3] scan transpose horizontally
CHECK-NEXT: 1 2 3
CHECK-NEXT: 2 4 6
CHECK-NEXT: 3 6 9
CHECK-NEXT: 4 8 12
CHECK-NEXT: [step 4] transpose the transpose
CHECK-NEXT: 1 2 3 4
CHECK-NEXT: 2 4 6 8
CHECK-NEXT: 3 6 9 12
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