sentences: balancing a ball on one 's nose is a kind of trick
docs: self_balancing is balancing. nosewheel is wheel. shovel_board is board_game. nose has 2_nostrils breathing_through_nose is one_way_to_control_breathing. nose is skill. balancing is performing. nose has two_nostrils playing_shovel_board is playing_game. nose has two_holes_called_nostrils