"Phonotactics determines phonological conditions and constraints on the occurrence or co-occurrence of sounds (vowels and consonants) in a given language. Morphonotactics refers to the interaction between phonotactics and morphotactics. The main approach to consonant clusters is based on the division into phonotactic and morphonotactic clusters. Phonotactic clusters occur within morphemes. Morphonotactic clusters arise as a result of morphological operations such as concatenation or apophony. Morphonotactic clusters are often phonotactically marked and often fail to surface as phonotactic clusters. The research focuses both on morphologically simple and complex clusters. The leitmotif of the present book is the verification of the hypothesis concerning the markedness of clusters in relation to their phonotactic or morphonotactic character. The dictionary and corpus data was examined in terms of markedness, based on universal phonotactic preferences. In order to evaluate cluster preferability, a phonotactic calculator was devised, which enables making measurements on a large scale."