Consider the product structure tree shown below: 
With a beginning inventory of ten for all components on level one,five for all components on level two,and zero for all components on level three and finished items,how many assembly E's are needed to produce 20 product X's?
Definitions:
3-D Movies
Films that create the illusion of depth perception, enhancing the viewing experience by using special glasses to see images in three dimensions.
Ambiguous Figures
Visual images that can be perceived in more than one way, illustrating how perception can be influenced by individual differences or context.
Perceptual Uncertainty
The state of being unsure about what is being perceived, often due to vague or ambiguous sensory information.
Place Theory
A theory in hearing that suggests tones are perceived by the location of their specific frequency along the cochlea's basilar membrane.
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