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Every practice in the library, in one list. Narrow it by how long you have, who it is written for, and where you are right now.
Narrow these down
Think of the reaction as a small program sitting quietly, waiting for one particular condition. It is not running all the time, and which condition wakes it is a question with an answer.
Keep a short list for a few weeks. Only what was happening in the ten seconds before: a tone of voice, being interrupted, somebody standing over you…
Looking for a whole subject rather than a single practice? Start from the nine areas.