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Plot t-SNE (perplexity 5/30/50) and UMAP (n_neighbors 5/15/50); colour A by U02 segment and B by true digit. Concepts: Neighbourhood preservation; perplexity; n_neighbors; local vs global structure Project A: Do segments appear as islands or a continuum? (Usually a continuum: segments are cuts, not islands.) Project B: Digits form 10 clear islands; confused pairs (4/9, 3/5/8) touch.