1.
Animated Stroke Order
2.
之所以 (zhī suǒ yǐ): (after a noun N and before a predicate P) the reason why N P (Conjunction) — Meaning & Stroke Order
HSK 3.0Level 6
[a more literary form of 的; showing possession]
[2nd syllable of many places]; [measure word for houses, buildings, institutions]