1: 폜˗(16)2: ()3: (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): (): ()