When you use a repeat block to loop your code
how does the computer know when it's repeated

enough times? The repeat block is actually
hiding a more sophisticated piece of code

called a for loop which counts from a starting
value up to an ending value by a specific

increment. For example, a repeat 3 block counts
from 1 to 3 by 1. Every time it counts, it

runs the code inside the loop. The for loop
knows how many times it has run by using a

counter variable that is set to the starting
value at the beginning of the loop and has

the increment added to it each time the loop
is run. As soon as the counter variable is

greater than the ending value the loop stops
running. The benefit of using a real for loop

instead of the repeat block is that you can
actually see the counter variable and use

it in your loop.