sentences: bedrock space to the mind is a mean of kaput
docs: euclidean_space is vector_space. central_passage_of_text has main_ideas backspace_key is key. dominant_terrain is piece_of_tactical_terrain. progress is matter_of_perspective. piece_of_tactical_terrain is tangible_thing. bedrock is rock. dominant_terrain is tactical_point. plot_of_land is solid_ground.