i u00d7 n respectively the sub matrices h h 1 12 b i 12 and h w 1 12 are of sizes n u00d7 8 u2212 n i n i u00d7 8 u2212 n i and n i u00d7 8 u2212 n respectively the sub matrices h h 1 21 b i 12 and h w 1 21 are of sizes 8 u2212 n u00d7 n i 8 u2212 n i u00d7 n i and 8 u2212 n i u00d7 n respectively and the sub matrices h h 1 21 b i 22 and h w 1 21 are of sizes 8 u2212 n u00d7 8 u2212 n i 8 u2212 n i u00d7 8 u2212 n i and 8 u2212 n i u00d7 8 u2212 n respectively then each term in eq 5 becomes as follows t ue89e h h i ue89e t i ue89e b i ue89e t i ue89e h w i ue89e t i n 0 0 0 ue8a0 h h i 11 h h i 12 h h i 21 h h i 22 ue8a0 b i 11 0 0 0 ue8a0 h w i 11 h w i 12 h w i 21 h w i 22 ue8a0 i n 0 0.