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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.
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Put the uncertainty at the front. Not Thursday, possibly Friday, most likely Monday is worth far more to the other person than a confident yes you cannot keep.
It feels worse to say, which is why people avoid it. But a hedge given early costs you nothing, while a promise broken later costs twice: the thing…
Looking for a whole subject rather than a single practice? Start from the nine areas.