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["bird","b1"],
["penguin","p1"],

[["penguin","?:X"],"=>",["bird","?:X"]],
[["-bird","?:X"],["flies","?:X"], ["$block", 3, ["$not", ["flies", "?:X"]]]],
[["penguin","?:X"],"=>",["-flies","?:X"]],

[["father","?:X","?:Y"],"=>",["anc","?:X","?:Y"]],
[[["anc","?:X","?:Z"],"&",["anc","?:Z","?:Y"]],"=>",["anc","?:X","?:Y"]],

[[["anc","?:Y","?:X"],"&",["penguin","?:Y"]],"=>",["penguin","?:X"]],
[[["anc","?:Y","?:X"],"&",["bird","?:Y"]],"=>",["bird","?:X"]],

[["bird","?:X"],"=>",["bird",["f","?:X"]]],

{"@question": ["flies","b1"]} 

]