Here are the queries:
console.log(myset.name);
console.log(myset.hobby);
console.log(myset.hobby.sport);
console.log(myset.class[1]);
console.log(S);
console.log(S.C);
console.log("B" in S);
console.log("b" in S);
console.log("x" in S);
console.log("x" in S.C);
Check the console for the answers!