等差数列

• ⺮(bamboo)RADICAL
• 寺(temple; pagoda)PHONO-SEMANTIC

Bamboo stalks stacked evenly in front of a temple suggest equality and waiting in order.

• 羊(goat)ASSOCIATIVE
• 工(craftsman; work)PHONETIC

Each hair of a goat differs from the rest, just like differences that are uneven and varied.

• 娄(many times; piled up)PHONO-SEMANTIC
• 攵(tap; hand motion)RADICAL

Counting numbers is using your hand to tap repeatedly many times in order to calculate.

• 歹(bones; death)ASSOCIATIVE
• 刂(blade; knife edge)RADICAL

Using a knife to chop bones into rows is the meaning of the character for arranging in lines.