source_list = [
    "longArticles_3f4d2a1c1cece4cf88d348f46fa3c20d",
    "longArticles_2872ec9931e405b04c70b5b35d64fa07",
    "longArticles_8ceadda6dfd935c9f85c5f3b5abd32a0",
    "longArticles_6b1f49e1bc19e22b1a2c2c252722f099",
    "longArticles_480827356b0eabc4b03b21acf4c2e664",
    "longArticles_60ac70dc7cbf8bf40fac1d51c007213e"
]

w = set(source_list)
print(w)