function [ext1,ext2,ext3,ext4] = create_lever_pulling_c_feedbacks
ext1 = zeros(8,4);
ext1(7:8,3) = 1;
ext1([3,6],4) = 1;
ext2 = zeros(8,4);
ext2(7:8,3) = 1;
ext2([4,5],4) = 1;
ext3 = zeros(8,4);
ext3(7:8,3) = 1;
ext3([3,5],4) = 1;
ext4 = zeros(8,4);
ext4(7:8,3) = 1;
ext4([4,6],4) = 1;