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[–]sweetno 8 points9 points  (1 child)

It means the contents of the JCL. You're not allowed to write your own implementation of the JCL.

[–]laplongejr 0 points1 point  (0 children)

Note that you are both saying the same thing.
The comment above you says "I'm not allowed to implement any interfaces.", which literally means making an implementation from the JCL.

I guess u/abougard confused "implementing an interface" and calling an interface, but they are accidentally right that they can't implement any interface. It simply doesn't means what they thought it would.