The first picture is the front viewof a stapler, the blue part is the dominant, the silver part besides the blue part is subdominant, the bottom is the subordinate.
The second picture is the side view. The blue part is d, the silver part besides the blue part is sd, the bottom is the so.

The third photo is the bottom view. The blue part is d, the silver part is sd, the black hole in the middle of the blue part is so.