空 kōng/kòng, empty/air/sky/in vain, to empty/vacant/unoccupied/space/leisure/free time 八 bā, eight/8 工 gōng, work/worker/skill/profession/trade/craft/labor 穴 xué, cave/cavity/hole/acupuncture point/Taiwan pr. [xuè] 宀 mián, "roof" radical in Chinese characters (Kangxi radical 40), occurring in 家, 定, 安 e...