A firm wants to reduce fluid drilling costs substantially by increasing drilling fluid efficiency. Research finds that both fluid drilling speed and cost are significantly influenced by Time, Geography, Drilling fluid type, Formation, and Well type. Geography refers to Country, Oil field, Block, Well containing the fluid; drilling fluid type contains classes and subclasses; Formation can be oil and gas, salt and gypsum, salt, gypsum; while the Well type can be Vertical, Directional, and Horizontal. Using this information, construct a star schema for analysis of drilling fluid efficiency.