`b,(a+b+c)^3+(a-b-c)^3+(b-c-a)^3+(c-b-a)^3`
`=a^3+3a^2b+3a^2c+3ab^2+6abc+3ac^2+b^3+3b^2c+3bc^2+c^3+a^3-3a^2b-3a^2c+3ab^2+6abc+3ac^2-b^3-3b^2c-3bc^2-c^3-a^3+3a^2b-3a^2c-3ab^2+6abc-3ac^2+b^3-3b^2c+3bc^2-c^3-a^3-3a^2b+3a^2c-3ab^2+6abc-3ac^2-b^3+3b^2c-3bc^2+c^3`
`=24abc`