Arrange the given words in the sequence in which they occur in the dictionary.
i. Prandial
ii. Preach
iii. Priam
iv. Price
v. Pseudo

Let's order the given words alphabetically step-by-step:
All words start with 'P'. Looking at the second letters:

'r' in Prandial, Preach, Priam, Price

's' in Pseudo
Since 'r' comes before 's', Pseudo (v) will be the last word.

Now comparing words starting with 'Pr':

Prandial (third letter 'a')

Preach (third letter 'e')

Priam (third letter 'i')

Price (third letter 'i')

Sorting by third letter:

'a' comes first → Prandial (i)

'e' comes next → Preach (ii)

Next is 'i'. Let's compare Priam and Price by their fourth letters:

'a' in Priam

'c' in Price
Since 'a' comes before 'c', Priam (iii) comes before Price (iv).

Putting it all together, the exact sequence is:
i. Prandial → ii. Preach → iii. Priam → iv. Price → v. Pseudo

Thus, the proper order code sequence is i, ii, iii, iv, v.