Search for words with a specific frequency of occurrence per million.
If all frequency search fields are filled the search for the exact value prevails over the others.
Since the values of relative frequency include several decimals, an exact search would yield few results and therefore would not be practical.
For this reason the search function works with integer values. For example, a search with a relative frequency of 20 will display words with a relative frequency between 20 and 20'99.