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Use "occurence" in a sentence
"The results using decimal approximations depend on the Flash app stopping when the 25th occurence is reached."
"Hitting preview, reading it, checking spelling, and assuming that the content will be forever saved by some chance technological occurence is a mixture of good practice and poor assumption, but when do those two ever exist together in perfect harmony?"
"In fact, this occurence is probably just one of many factors that led to the drop in CD sales."