Double 4 creates a solid foundation like two pillars supporting a building. The 7 adds depth of thought, while root 6 channels energy into creating a cozy home and strong family bonds.
History
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Chinese numerology
A number with double 四 (sì) — a challenge to fate. The resemblance to 'death' frightens the superstitious, but 七 (qī) brings rise — 起 (qǐ). This combination teaches overcoming fears through wisdom.