由于 (yóuyú) · because of

由 yóu · by

What 由 is made of

由 is not built from smaller parts; it is written with 5 strokes.

Origin hint: Road 丨 leading to the farm 田 (from the Make Me a Hanzi dataset; treat as a memory aid where history is uncertain)

于 yú · at

What 于 is made of

• 二 — two strokes
  • 一 — horizontal stroke
  • 一 — horizontal stroke
• 亅 — hook