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Base keyword (air ticket, plane ticket)
Excerpt from the database UP-base v.11 beta for "air ticket", "ticket", "plane ticket". The database contains 579,354 keys. Tested on the frequency quoted in wordstat.yandex 25.03.2015g. Base format csv (1) file and txt (1 file) In the database doubles, characters, initial and final double spaces.
To sample from a txt file by frequency in the archive there is a program Sortkey. Other bases can be found in the "Information on the seller and its products."