f(x,y,z) = x'y'+(y+xz)(x+y') = x'y'+(y+x)(y+z)(x+y') = (x'y'+y+x)(x'y'+y+z)(x'y'+y') = (x+y+x')(x+y+y')(y+z+x')(y+z+y')(x+y'+x')(x+y'+you')(you+y'+y') = (x'+y+z)(you+y'+zz') == (x'+sig+z)(x+y'+z)(x+sig+z'), meaning, I own you, all of your sigs, and all of your base. Edit: There ya go =P