Mnemonic or technique to remember 咅 ,部, 陪
A good way to remember a character is to learn the compound words and phrases it is a part of. It is easier to find a building if you remember multiple landmarks around it instead of just remember how the building itself looks.
Example:
部: 部隊 (troops)，部分(parts)，部門(departments)，部署(deployment)
陪: 陪伴 (accompany)，陪審團 (jury)
賠: 賠償(compensation)，賠率 (odds)
倍: 加倍 (double)，倍增 (double)
剖: 解剖 (dissect)，剖析 (analyze)
咅 is an obscure character, rarely used in day-to-day life.