Just finished the [[CS21AFirst03#Exercises.Aquarium][Aquarium]] exercise

So that’s two lab exercises written today, yay! I’d have settled for
5×5, but Dr. Sarmenta did loop() and I guess I need to go over 1-d
arrays a bit more before going into 2-d ones. I’ll still go through
with the quiz tomorrow, though; I want to check what they know about
declaring, creating and using arrays. How will I do it? Ah.