function [Aina,Bina] = constrict(m,h,T)
% stricture constraints

if ~exist('T','var')
  T = 1;
end

SIGNS = 2*list_all_ind(repmat([2],[1 m]))-3;
Aina = zeros(size(SIGNS,1)*m*(m-1)/2*T,m^2*T);
rind = 0;

for t=1:T
  for i1=1:m
    for i2=i1+1:m
      for s = 1:size(SIGNS,1)
        rind = rind+1;
        ss = SIGNS(s,:);
        for j=1:m
          ind1 = coord2ind([j i1 t],[m m T]);
          ind2 = coord2ind([j i2 t],[m m T]);
          Aina(rind,ind1) =  ss(j);
          Aina(rind,ind2) = -ss(j);
        end
      end
    end
  end
end
Bina = ones(size(Aina,1),1)*h;
Bina = Bina * 2;
return