[ ( fromList [ 1 , 2 ]
  , [ fromList [ 1 , 2 , 5 , 6 , 7 ]
    , fromList [ 1 , 2 , 7 , 8 , 9 ]
    ]
  )
, ( fromList [ 1 , 2 , 7 ]
  , [ fromList [ 1 , 2 , 5 , 6 , 7 ]
    , fromList [ 1 , 2 , 7 , 8 , 9 ]
    ]
  )
, ( fromList [ 1 , 7 ]
  , [ fromList [ 1 , 2 , 5 , 6 , 7 ]
    , fromList [ 1 , 2 , 7 , 8 , 9 ]
    , fromList [ 1 , 7 , 9 ]
    ]
  )
, ( fromList [ 1 , 7 , 9 ]
  , [ fromList [ 1 , 2 , 7 , 8 , 9 ] , fromList [ 1 , 7 , 9 ] ]
  )
, ( fromList [ 1 , 9 ]
  , [ fromList [ 1 , 2 , 7 , 8 , 9 ]
    , fromList [ 1 , 7 , 9 ]
    , fromList [ 1 , 9 ]
    ]
  )
, ( fromList [ 2 , 5 ]
  , [ fromList [ 1 , 2 , 5 , 6 , 7 ] , fromList [ 2 , 3 , 4 , 5 ] ]
  )
, ( fromList [ 2 , 7 ]
  , [ fromList [ 1 , 2 , 5 , 6 , 7 ]
    , fromList [ 1 , 2 , 7 , 8 , 9 ]
    , fromList [ 2 , 7 , 9 ]
    , fromList [ 2 , 7 , 9 ]
    ]
  )
, ( fromList [ 2 , 7 , 9 ]
  , [ fromList [ 1 , 2 , 7 , 8 , 9 ]
    , fromList [ 2 , 7 , 9 ]
    , fromList [ 2 , 7 , 9 ]
    ]
  )
, ( fromList [ 2 , 9 ]
  , [ fromList [ 1 , 2 , 7 , 8 , 9 ]
    , fromList [ 2 , 7 , 9 ]
    , fromList [ 2 , 7 , 9 ]
    ]
  )
, ( fromList [ 7 , 9 ]
  , [ fromList [ 1 , 2 , 7 , 8 , 9 ]
    , fromList [ 1 , 7 , 9 ]
    , fromList [ 2 , 7 , 9 ]
    , fromList [ 2 , 7 , 9 ]
    ]
  )
]