Every June when millions of people worldwide are commemorating the anniversary of the 1989 Tiananmen Square protest, thousands of censors hired by China’s Internet companies are working in overdrive to remove words deemed sensitive by the government from social media.

The demonstration led by students attracted over 1 million protesters to occupy the iconic square during the spring of 1989 for seven weeks demanding political reforms. After much debate within the Communist Party of China, the government deployed armed soldiers and tanks to clear the square by force. Since then it has been suppressing discussions about the protest by censoring books, media programs and digital content related to the issue.

Required to cooperate with the government, Internet companies delete any reference to the protest. Search engines return no results when people search for words related to the issue.

These words were picked from a crowdsourced list contributed by Weibo users who found that no result was returned when they searched those words on Weibo. The words were then verified by China Digital Times (CDT), a news website focusing on Internet censorship in China, before published.

IBTimes researched each of the 1,188 words collected from January 2013, when China’s then president-nominee Xi Jinping was getting ready to take over the Communist Party and the state, until this week, which marks the 26th anniversary of the Tiananmen Square protest.

Now, let’s see the words.