groupCheckTests :: [(String, Bool)]
groupCheckTests =
  [ ("{()[]}", True)
  , ("{([)]}", False)
  , ("[()[]]", True)
  ]
groupCheckTests :: [(String, Bool)]
groupCheckTests =
  [ ("{()[]}", True)
  , ("{([)]}", False)
  , ("[()[]]", True)
  ]
groupCheckTests =
  [ ("{()[]}", True)
  , ("{([)]}", False)
  , ("[()[]]", True)
  ]