Now E1 and E2 share a symbol, say S_E. E4 and E5 differ by 2 in number.
Let us solve a classic matrix arrangement problem exactly as taught in the lesson.
The Elites Grid LRDI faculty suggests a 3-day revision plan:
For large matrices (8x8 or 10x10), physically fold the paper or use your finger to track row-wise eliminations. This reduces cognitive load.