Test for as-yet-non-existent cell pattern difference
Time the transmission
expand method - wrote and tested
diff_matrix written, still failing; need to figure out if the test or the code is wrong
Let's say the test is right
Assume that a 6-element array is already expanded, so that expand(x) == expand(expand(x))
Slightly more realistic simulation
Factor the describe-blind-movements logic into its own function
Yet more realistic messages
Use words for numbers