I keep getting stuck on the first line of the while loop where the instructions are to create a `while`

loop that compares an element in `left_part`

to an element in `right_part`

, and merges the smaller element to the main `array`

list. I don’t understand the syntax needed for comparison and then to merge the elements into an array list.

### Your code so far

```
def merge_sort(array):
middle_point = len(array) // 2
left_part = array[:middle_point]
right_part = array[middle_point:]
merge_sort(left_part)
merge_sort(right_part)
left_array_index = 0
right_array_index = 0
sorted_index = 0
# User Editable Region
while left < len(left_part) and right < len(right_part):
left_array_index < len(left_part)
right_array_index < len(right_part)
pass
# User Editable Region
```

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### Challenge Information:

Learn Data Structures by Building the Merge Sort Algorithm - Step 11