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In my case, test 5 still had the number 2 as the expected answer.
Thank you very much.
In this case, there should be four happy faces: [:), :), x-], :ox, ;-(, ;-), ;~(, :~D]
:), :), ;-), :~D
However, according to the test case, there are only two.
Even if we remove the repeated one, there are still three faces that meet the condition.