//M0//QN1//SUB//DL0//EQ
(i) A = {a, b, c}
//X
{kxu, A' = U – A = {d, e, f, g, 
}
}(ii) B = {d, e, f, g}
{kxu, B' = {a, b, c, h}
(iii) C = {a, c, e, g}
{kxu, C' = {b, d, f, h}
(iv) D = {f, g, h, a}
{kxu, D' = {b, c, d, e}
//M0//QN1//SUB//DL0//EQ
(i) A = {a, b, c}
//X
}