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Senior scenarios: 8 more common DE problems (95-102)
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Senior scenarios: rewrite 91-94 in plain conversational voice
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Add 4 senior-scenario problems (91-94)
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Add 15 new problems for Wave 3 (76-90)
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Wave 2 batch 4: mermaid in 040, 069, 071, 072, 075
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Wave 2 batch 2b: mermaid in problems 21, 23, 27, 28
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Wave 2 batch 2a: mermaid in problems 9, 15, 16, 17
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Wave 2 batch 1: mermaid diagrams in problems 7, 8, 10, 11, 12, 13, 14
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Rewrite problems 002-005 in code-only multi-approach format
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Restructure wave 1.5: split Databases and Cloud & Cost, rewrite probl…
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Add learn_order and interview_value to every problem
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Restructure Problems 66-75 into problems/0NN-slug layout (#2)
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Improve tone across all 65 problems
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