> a' = (a + b + c + d + e + f + g + h) /8 > b' = (a + b + c + d - e - f - g - h) /8 > c' = (a + b - c - d - e - f + g + h) /8 > d' = (a + b - c - d + e + f - g - h) /8 > e' = (a - b - c + d + e - f + g - h) /8 > f' = (a - b - c + d - e + f + g - h) /8 > g' = (a - b + c - d - e + f - g + h) /8 > h' = (a - b + c - d + e - f + g - h) /8 ARGH !!!!! this is FALSE !! i've lost 2 hours on it =(