A study of the variability of multi-word lexical units with repetition of lexemes such as "Bůh dal, Bůh vzal" 'the Lord has given, the Lord has taken away' based on a large corpus is presented. Four case studies illustrate the extent of variability of such expressions.
A database of multi-word expressions is described, with a special attention to expressions with repetition and their variability. The automatic identification of multi-word expressions with repetition in Czech texts is also explained.