i$.$ Consider the following definitions:

Let one class be reading glasses, and it is codivisional with the class sunglasses.

Let another class be cheap glasses, and it is codivisional with the class expensive glasses.

Give the Normal Form for the Propositions below based on these classes.

$1.$ Some sunglasses are expensive.

$2.$ None of the reading glasses are expensive.

$3.$ All of their cheap glasses are reading glasses.

$4.$ Only one pair of cheap glasses is meant for reading.