@ syeda zainab
According to new grouping and rules, there is no restriction for opting one subject and excluding the other subject. One just has to follow the one rule: Opt one subject of 200 marks from first two groups; opt just one subject of 100 marks from group 3 to 7.
Now, literature and regional languages or International Law and Intl Relations can be opted simultaneously.

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"But screw your courage to the sticking place,
And we'll not fail." _Shakespeare, 'Macbeth')