`#3107.101107`
`3(a + b)(a + c)(b + c)`
`= 3(a^2 + 2ab + bc)(b + c)`
`= 3(a^2b + a^2c + 2ab^2 + 2abc + b^2c + bc^2)`
`= 3a^2b + 3a^2c + 6ab^2 + 6abc + 3b^2c + 3bc^2`
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