空 U+07a7a 空
Radical: 穴
Decomposition: ⿱穴工
Acjk: 空⿱穴.5工3
Definition: empty, hollow, bare, deserted
技 U+06280 技
Radical: 扌 (手)
Decomposition: ⿰扌支
Acjk: 技⿰扌.3支4
Definition: skill, ability, talent, ingenuity
术 U+0672f 术
Radical: 木
Decomposition: ⿻木丶
Acjk: 术⿻木.4丶1
Definition: art, skill, special feat; method, technique