From the description:

Each smiley face must contain a valid pair of eyes. Eyes can be marked as : or ;
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A smiley face can have a nose but it does not have to. Valid characters for a nose are - or ~
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Every smiling face must have a smiling mouth that should be marked with either ) or D
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You're wrong, the test is fine.

And in the description not all valid and invalid combinations are listed, just a few as examples.