i am getting the cordinates of these all boundaries but i cannot understand how to store greeen boundaries in separate cell array with coresponding parent boundary number e.g( parant,cild 1 boundary) .my c0de is attached here

[B,L,N,A] = bwboundaries(BW);
% figure; imshow(BW); hold on;
% % Loop through object boundaries
% for k = 1:N
%     % Boundary k is the parent of a hole if the k-th column
%     % of the adjacency matrix A contains a non-zero element
%     if (nnz(A(:,k)) > 0)
%         boundary = B{k};
%         plot(boundary(:,2),...
%             boundary(:,1),'r','LineWidth',2);
%         % Loop through the children of boundary k
%         for l = find(A(:,k))'
%             boundary = B{l};
%             plot(boundary(:,2),...
%                 boundary(:,1),'g','LineWidth',2);
%         end
%         enclosed_boundaries = find(A(:,k));
%     end
%end
%enclosing_boundary  = find(A(m,:));