• 一(one; horizontal stroke)
• 二(two (pictograph – two horizontal strokes))

Three horizontal strokes stacked on top of each other symbolize the number three.

• 酉(wine vessel; ferment)
• 夋(slow manner; leisurely pace)

Fermenting alcohol produces sourness, which is exactly the character for sour.

• 氵(water; liquid)
• 由(from; due to; oil (phonetic))

Oil is a liquid that flows from a natural source.

• 一(one; horizontal stroke)
• 二(two (pictograph – two horizontal strokes))

Three horizontal strokes stacked on top of each other symbolize the number three.

• 酉(wine vessel; ferment)
• 夋(slow manner; leisurely pace)

Fermenting alcohol produces sourness, which is exactly the character for sour.

• 氵(water; liquid)
• 由(from; due to; oil (phonetic))

Oil is a liquid that flows from a natural source.