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.
3287 Solvers
407 Solvers
192 Solvers
409 Solvers
Arrange vector in ascending order
628 Solvers
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