Renowned author Uroob's masterpiece novel Sundarikalum Sundaranmarum  is set in the backdrops of Malabar Rebellion. The novel has about thirty characters belonging to three generations of eight families belonging to Malabar during the end of the Second World War. Sundarikalum Sundaranmarum won the Kendra Sahitya Akademi Award, India's most prestigious literary award, in 1960. It also received the Asan Centenary Award in 1973, a special award given by the Kerala Sahitya Akademi for the most outstanding work since Independence. The 1988 Malayalam language film 1921 or Ayirathi Thollayirathi Irupathonnu , directed by I. V. Sasi and written by T. Damodaran, depicts the events of the rebellion. The film stars Mammootty as Khadir, a retired Mappila soldier, alongside Madhu as Ali Musliyar. The film won the Kerala State Film Award for Best Film with Popular Appeal and Aesthetic Value in the same year. The rebellion also spawned a large number of Mappila Songs. Many of these describe the events surrounding the Khilafat movement in Malabar and offer a view of conditions in the area at the time. Ahmed Kutty composed the Malabar Lahala enna Khilafat Patt in 1925, which describes the events of the rebellion. Many of rebel prisoners such as Tannirkode Ossankoya composed songs in their letters to relatives. The rebellion triggered the development of Mygurudu, a Malayalam-based secret language. Prisoners used this coded language to pass messages without getting leaked out to the authorities.In later times, this language was also used by employees of Beedi manufacturing units of North Kerala among others.
Question: Which events triggered the development of Mygurudu, a Malayalam-based secret language?
Answer: the events of the rebellion