Abstract
Length motifs (L-motifs) are defined as sequences of words whose lengths are monotonously increasing. In recent years, L-motifs have attracted well-deserved attention as they provide a new view of texts and their syntagmatic properties and nested structures.
This study examines the key L-motifs, i.e. motifs that are overrepresented in texts and negative key L-motifs that are underrepresented in texts. The data reveal motifs that are typical for Czech texts motifs, typical for Arabic texts and those motifs that are typical for both Czech and Arabic texts - their existence suggests that there are new general language-independent patterns waiting to be explored.