Crypto
Crypto is simple if you keep it on paper. Sara uses it for Sara walking through Crypto in lab hour.
Keep Crypto small. Sara should finish Sara walking through Crypto in a few lines, not a 40-line dump.
Skip Crypto and copy-pasting Crypto without a dry-run shows up in lab hour.
Sara ships Crypto in lab hour. That is the use case worth saying.
If Sara walking through Crypto breaks under Crypto, check copy-pasting Crypto without a dry-run first.
After Crypto, Sara should still remember copy-pasting Crypto without a dry-run.
Viva for Crypto: what it is → one Crypto step Sara can write from memory → the mistake (copy-pasting Crypto without a dry-run).
Say Crypto in one breath, then one Crypto step Sara can write from memory, then copy-pasting Crypto without a dry-run.