String Set Deduplication

Problem

Remove duplicate strings from a list while preserving the order of first occurrences.

Comparison is case-sensitive and exact. Keep a string the first time it appears and skip all later repeats.

Return the deduplicated list.

Hint

Track seen strings in a set and append only when the string is new.

case 1

in: [["a","b","a","c","b"]]

expected: ["a","b","c"]

case 2

in: [[]]

expected: []

case 3

in: [["x"]]

expected: ["x"]

case 4

in: [["A","a","A"]]

expected: ["A","a"]

Starter codePython

def dedupe_words(words):
    # Your code here
    pass

4 test cases · run your code against them in the editor