difference {
        box {
                <-10, 0, -10>  // one corner position <X1 Y1 Z1>
                < 10,  20,  10>  // other corner position <X2 Y2 Z2>
                pigment { color rgb <1,0,0> }
        }

        union {
                box {
                        <-9,0, -9>
                        <9,19,9>
                        pigment {color rgb <1,0,0> }
                }

                box {
                        <-2.5,0,-10>
                        <2.5,5,-5>
                        pigment {color rgb <1,0,0> }
                }
       }
}


Somebody tell me what I'm doing wrong there, or somehow to get the second
box to subtract as well

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