Exercise: Write down 3 sets of values while measuring the time to get the following results:
0 1 2 3 4 5 6 7 8 9 a b c d e f g h i j I II III IV V VI VII VIII IX X
First time write these horizontally:
In the next round write the same ones down, but this time start by writing down the first value of each, then the second value of each. (So you'd first write down 0, a, I, then 1, b, II etc.)
Observe how much longer the second method takes.