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Lab 12: Part 0: Warm up
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# Lab 12: Part 0: Warm up
## Paper worksheet
[Click here for worksheet](https://docs.google.com/document/d/1gbbPIuLKEHtOxHPC3vp5IaNJmCnpU_4-uAVd5Kglv8g/edit?usp=sharing)
## Part 0. chop
```py
def chop(num):
if num > 0:
print(num)
chop(num//2) # integer division
```
Given the function `chop` above, predict what is printed:
```py
>>> chop(0)
>>> chop(6)
>>> chop(15)
```
Make your predictions and discuss with your partner before running the code.
## Part 1. fade
```py
def fade(s):
if len(s) > 0:
print(s)
fade(s[1:])
```
Given the function `fade` above, predict what is printed:
```py
>>> fade('')
>>> fade('hat')
>>> fade('scarf')
```
Make your predictions and discuss with your partner before running the code.
## Part 2. grow
```py
def grow(s):
if len(s) > 0:
grow(s[1:])
print(s)
```
Given the function `grow` above, predict what is printed:
```py
>>> grow('')
>>> grow('hat')
>>> grow('scarf')
```
Make your predictions and discuss with your partner before running the code.
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## [OPTIONAL] Part 3. both
```py
def both(s):
if len(s) > 0:
print(s)
both(s[1:])
print(s)
```
Given the function `both` above, predict what is printed:
```py
>>> both('hat')
```
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## [OPTIONAL] Part 4: English plan
Come up with a plan in English to recursively solve this problem.
A function called `row(number, size)` draws a horizontal row of number squares of size `size`. This function must be **recursive** and maintain a position and heading invariant*. Assume you are given a function `square(size)` that draws a square with side `size`.
*what does this mean?
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