Restrict selection of same combination of options in a repeat group

I am developing a form whereby users can choose options from two lists:

seasons (s1, s2, s3, s4)
crops (c1, c2, c3, c4).

If a user selects s1/c2, this option should not be available in subsequent repeats.

Welcome to the community, @jmutua! Maybe this support article Adding Cascading Select Questions should help you solve your issue.

In addition to this, you should also be able to learn more about cascading select questions from our previous discussion that has happened here.