空 U+07a7a 空
Radical: 穴
Decomposition: ⿱穴工
Acjk: 空⿱穴.5工3
Definition: empty, hollow, bare, deserted
区 U+0533a 区
Radical: 匸
Decomposition: ⿷匸乂
Acjk: 区⿷匸.:1乂2匸.:1
Definition: area, district, region, ward
群 U+07fa4 群
Radical: 羊
Decomposition: ⿰君羊
Acjk: 群⿰君7羊.6
Definition: group, crowd, multitude, mob