I think the correct example solution is {'Y1', 'Y12', 'Y3'}.
Good exercise. Two comments: 1) test case 3 has unbalanced parentheses. 2) Instruction should say that your are expecting results to be returned in sorted order, rather than the order in which they appear in the expression.
Find state names that start with the letter N
599 Solvers
6283 Solvers
276 Solvers
531 Solvers
57 Solvers
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