Apedia

 To Object Place Planned  Progressive Tenses A  Chance — Followed

Front
[no object]
: to take place especially without being planned : 
occur
https://www.learnersdictionary.com/definition/occur
not used in progressive tenses
: to do or be something by chance — followed by to + verb

    — used with it to describe something that occurs by chance
    Back happen, heppened, happened: happens, happening

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