Which step number is the following step?
Envelop 2 identical 13 unique 29 6 boss couple 12 happy 28
Words starring with vowel in given input are arranged in ascending order with a prime number arranged in ascending order. Consonants are arranged in descending order with a composite numbers arranged in descending order. Input: 2 6 couple boss 28 13 identical envelop 12 29 unique happy Step I: envelop 2 6 couple boss 28 13 identical 12 29 unique happy Step II: envelop 2 6 couple boss 13 identical 12 29 unique happy 28 Step III: envelop 2 identical 13 6 couple boss12 29 unique happy 28 Step IV: envelop 2 identical 13 6 boss 29 unique couple 12 happy 28 Step V: envelop 2 identical 13 unique 29 6 boss couple 12 happy 28 Step VI: envelop 2 identical 13 unique 29 boss 6 couple 12 happy 28