Nailed unit economics (CAC, margins, LTV).
What I found is that written evidence for knocking on wood (and for the history of gesture as a whole) is remarkably sparse. In the Penguin Guide to Superstitions, folklorist Steve Roud offers a skeptical take on the provenance of knocking on wood due to the near total absence of written records about it:
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第一百二十八条 担保人应当保证被担保人不逃避行政拘留处罚的执行。
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