Table 4.

Hierarchical topic reduction of Top2Vec.

No.	Topic/content	Examples of keywords
1	Diversity visa / Student life	byron, selectees fault, bay, mask, are increasing, student, the flu, exams, forever, first wave, take, traveling, covid positive, there, hands, rapidly, want, big, stop, death, interstate, fucking, haven, market, transmission, covid appropriate, bihar, to wear, short, exam, increasing
2	Diversity visa and visa petition / freedom / international travel / COVID-19 curfew	the petition, sign, tests for, pcr covid, selectees fault, boris, ford, ontario, want, curfew, premier, the airport, free, friend, trudeau, postpone, check out, rapidly, pakistan, shot, uk, enjoy, stay at, true, thread, toronto, travel insurance, international travel, normal, many countries, variants, overseas travel, freedom, mps, interstate, red list, folks, canadians, reasons, province, bihar
3	Diversity visa / unvaccinated people / vaccinate to prevent	selectees fault, centers for, di, disease, white, labor, fauci, economy, behavior, million, not being, market, shame, europeans, kerala, americans, control, here are, millions of, trump, unvaccinated, buy, weekend, make sure, oct, and tourism, dv, jobs, to protect, shop, this weekend, of vaccination, concerns, for your, air travel, next month, vaccines, open, to ease, political, millions, virus, prevention, cover, plans to, science, mexico, tourism
4	Politicians (Grant Shapps, Justin Trudeau, Biden, Trump, Anthony Fauci) / green list countries / international travel for vaccinated people / olympics / COVID-19 passport	on vaccination, eu, covid certificate, requirement for, ban, borders to, biden, grant, shapps, president, even worse, chinese, olympics, trudeau, european, required for, digital, vaccinated travelers, fauci, many countries, justice, vaccinated travelers, travel pass, visas, other countries, trump, the federal, countries, australians, green list, law, infected, joe, the border, for fully, interstate travel, europe, open, next month, covid passports
5	Pre-COVID and first wave / dreaming of travel	first wave, shelby, battle, solutions, simon, they find, the emergence, their journey, countless, lives, future, someone, human, money, an excuse, traveling, love, before covid, dose, happy, traveled, pfizer, from china, dream, together, selectees fault, died of
6	Complaints toward the US Diversity Visa Lottery program (COVID-19 as an excuse for the delay or cancellation thereof)	an excuse, toolset, selectees fault, even worse, on vaccination, uganda, death, justice, pcr tests, new cases, arabia, interview, the highest, united states, fun, winners, crazy, for fully, for foreign, nepal, imple, clear, african, nigeria, business travel, puerto rico, brexit, the airport, requiring, singapore
7	Yellow fever and COVID-19 vaccine / Saudi Arabia / COVID-19 cases	saudi, astrazeneca, journey, arabia, stay safe, new cases, covid numbers, dose of, nhs covid, wave, wear mask, got covid, yellow fever, pass, app, pre covid, doctors, eastern
8	Travel Destinations / Prevention / Travel Measures	dv, selectees fault, blaming, lanka, covid appropriate, rapidly, european, solutions, union, they find, the emergence, winners, travel advisory, increase, nepal, prevention, the delta, travel measures, covid cases, shelby, surge in, level, do not, new cases, travel related, eu, probably, hawaii, postpone, indian, to restrict, battle, florida, are increasing, rising covid, olympics, governor
9	Negative PCR test prior to departure / fully vaccinated for international travel	proof of, departure, hours before, covid appropriate, as long, will need, covid testing, negative covid, be fully, pre departure, to show, requirement for, you must, required to, by air, foreign travelers, test for, covid test, behavior, vaccinated against, test, pcr test, pcr tests, arrival, fully vaccinated, on vaccination, requirement, of vaccination, negative test, pcr, vaccination, negative, are fully, cdc, required, for international, requirements for, distancing, to require, guidance, on arrival, days of
10	Travel bubble / Australia (several cities included) and New Zealand / Hong Kong / Scotland / quarantine free / quarantine hotel	nsw, queensland, sydney, victoria, have tested, coast, shelby, melbourne, travel bubble, zealand, quarantine free, australia, in hotel, positive for, simon, wales, traveled from, kong, covid case, positive covid, battle, tested positive, first wave, vic, greater, auckland, woman, their journey, byron, the petition, hotel quarantine, scotland, south, army