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並前往https://stackoverflow.com/questions/31635257/look-for-word-in-sentence-with-r-if-not-there-drop-row

Look for word in sentence with R, if not there: drop row - Stack ...

Coming at this from another angle to my (now deleted) previous answer,. given an example of your final data frame e t1 <- "Het aids-probleem ontstaat door ...

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