There are two kinds of sequences of consonantal elements in English, namely initial and final sequences. The sequences are called clusters
English has 51 initial clusters: 43 with 2 consonantal elements in a sequence, and 8 with 3 consonantal elements in a sequence. A. The two-initial consonantal elements (clusters) in a sequence are: 1. / bj / beautiful 2. / dj / duty 3. / fj / few 4. / hj / humor 5. / kj / cube