[racket] help me

Hello my name is Gizem. I live in Turkey and I am a student at izmir
University. I am learning DrRacket.

I hava a problem. I am trying to create "subset" and "intersection-set" but
 program gives this error: "if: expected a question and two answers, but
found 4 parts"

This is my program.




-- 
>>Gizem Toldare
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