a unscrew is a mean of hard implement
ax is cutting_implement. shrew is mammal. unseparated_thing is not constructed_route. short_tailed_shrew is shrew. unseparated_thing is constructed_route. if unscrew occurs then rotate occurs. step_ladder is collapsible_device. if unscrew does not occur then rotate occurs. backboard is non_powered_device. ax is not cutting_implement.