Considering the following code:

x $=[0,0,0,0]$

y $=[0,1,2,3]$

for i in range$($len$($x$))$:

$$ print$("("+$ str$($x$[$i$]),+","+$ str$($y$[$i$])+")")$

$$

This code prints out $($x$,$y$)$ coordinate pairs.

It is an example of using $\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ lists.