Arrange the given words in the sequence in which they occur in the dictionary.
i. Permanence
ii. Permanent
iii. Permafrost
iv. Permeability

Let's examine the letters sequentially to sort alphabetically:
All words start with Perm-.

Looking at the 5
th
letter:

i. Permanence (a)

ii. Permanent (a)

iii. Permafrost (a)

iv. Permeability (e) → Comes last since 'e' comes after 'a'.

Now let's compare (i), (ii), and (iii) using their 6
th
letter onwards:

i. Permanence (n)

ii. Permanent (n)

iii. Permafrost (f) → 'f' comes before 'n', so (iii) is first.

Now compare (i) and (ii):

i. Permanence (c)

ii. Permanent (t) → 'c' comes before 't', so (i) comes before (ii).

Putting it all together, the exact dictionary sequence is:
iii, i, ii, iv