“…= W ( Tj -(iO( Tj . )o,t/;( T> )i,... ,tO(r,)2'-i) the Walsh vector of T,, it follows from(7), that So, we have to calculate the first order Walsh coefficients of r, (0 ^ j' ^ £ -n). In order to do this, denote by Aj the subset consisting of n consecutive indices, starting in j , that is, A, = {j,j + l,...,j + n-1}.Fix an index i (0 ^ i < £), and consider the schema % = # .…”