Nailed unit economics (CAC, margins, LTV).
if (n <= 1) return 0;
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1936年10月，历经艰苦卓绝的二万五千里长征，红军三大主力胜利会师，淬火新生的中国共产党由此开启了中国革命波澜壮阔的新画卷。
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