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	`1`	`+# Task 15`
	`2`	`+# Implement a function to reverse a linked list.`
	`3`	`+`
	`4`	`+def reverse_linked_list(linked_list):`
	`5`	`+ return linked_list[::-1]`
	`6`	`+`
	`7`	`+`
	`8`	`+def test_reverse_linked_list():`
	`9`	`+ test_data = [`
	`10`	`+ ([1, 2, 3, 4, 5], [5, 4, 3, 2, 1]),`
	`11`	`+ ([1, 2, 3, 4, 5, 6], [6, 5, 4, 3, 2, 1]),`
	`12`	`+ ([1], [1]),`
	`13`	`+ ([], []),`
	`14`	`+ ]`
	`15`	`+ for linked_list, expected in test_data:`
	`16`	`+ assert reverse_linked_list(linked_list) == expected`

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	`1`	`+# Task 16`
	`2`	`+# Implement a function to find the sum of digits of a number.`
	`3`	`+import pytest`
	`4`	`+`
	`5`	`+`
	`6`	`+def sum_of_digits(number):`
	`7`	`+ sum = 0`
	`8`	`+ for digit in str(number):`
	`9`	`+ sum += int(digit)`
	`10`	`+ return sum`
	`11`	`+`
	`12`	`+`
	`13`	`+@pytest.mark.parametrize("number, expected_sum", [(123, 6), (1234, 10), (12345, 15)])`
	`14`	`+def test_sum_of_digits(number, expected_sum):`
	`15`	`+ assert sum_of_digits(number) == expected_sum`

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	`1`	`+# Task 17`
	`2`	`+# Write a program to merge two sorted lists into a single sorted list.`
	`3`	`+`
	`4`	`+def merge_sorted_lists(list1, list2):`
	`5`	`+ return sorted(list1 + list2)`
	`6`	`+`
	`7`	`+`
	`8`	`+def test_merge_sorted_lists():`
	`9`	`+ assert merge_sorted_lists([1, 2, 3], [4, 5, 6]) == [1, 2, 3, 4, 5, 6]`
	`10`	`+`

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