The first line illustrates consonant clusters, the second line shows ending consonants that are omitted, and the third line gives examples of ending consonants that are written.
These are common consonant clusters at the end of words.
an unpronounceable foreign word; unutterable consonant clusters.
Unutterable consonant clusters.
These are common consonant clusters at the beginning of words.
Eight important topics are included, such as "vowel sounds", "consonant clusters", "stress and rhythm", "sounds in connected speech", "intonation" and so on.
This is, as somebody mentioned before, because of the numerous consonant clusters that exist in English, whereas such clusters do not exist in Japanese.