Counterbalance between 3-4 blocks
I have 4 different blocks in my experiment and I want to do a counterbalancing between blocks. I watched @sebastiaan 's tutorial (https://www.youtube.com/watch?v=zP8ucRtWU5g), and followed the steps there, but whenever I try to run the experiment I get a message saying b1 is not defined. How can I solve this? is there another way of having counterbalance between blocks?