1 | initial version |

You'll also need to use `Graphics()`

prior to your `for`

loop to define `p1`

and `p2`

to be graphics objects. (As an option, you could use the `+=`

assignment to shorten the code.)

```
t=var('t')
p1=Graphics()
p2=Graphics()
for i in range(-3,3,1):
p1 +=parametric_plot((t,i),(t,-5,5),color="red")
p2 +=parametric_plot((i,t),(t,-5,5),color="gray")
show(p1+p2)
```

2 | No.2 Revision |

You'll also need to use `Graphics()`

prior to your `for`

loop to define `p1`

and `p2`

to be graphics objects. ~~(As an option, you could use the ~~`+=`

assignment to shorten the code.)

```
t=var('t')
p1=Graphics()
p2=Graphics()
for i in range(-3,3,1):
p1 +=parametric_plot((t,i),(t,-5,5),color="red")
p2 +=parametric_plot((i,t),(t,-5,5),color="gray")
show(p1+p2)
```

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