[cl-who-devel] Building a table from a list of strings - Can't seem to get it right

Looking at the checkerboard-like example in the docs and trying to figure out how to get a table from a list of strings. Assume a list of 50 strings and I want to get them into a table that is 5 cells wide and 10 high. I can't seem to get the loop(s) right with the rows. I can do this without cl-who, but there should be an obvious method that I'm missing to be able to do this with cl-who. I apparently don't know enough loop-fu. Any pointers would be appreciated. Bryan