Some parts of the sentence given below have been jumbled up. You are required to re-arrange these parts which are labelled P, Q, R and S to produce the correct sentence. Choose the proper sequence from the options.
You can learn (P)
and can be quite difficult (Q)
as well as the difficult ones (R)
the easy things (S)
although the easy ones are not so easy
Which one-of the following is the correct sequence?