Please generate a reimbursement flowchart using markdown syntax. If the reimbursement amount is less than 10000 yuan, only the immediate superior needs to approve it. If it is greater than 10000 yuan, it needs to be approved by the immediate superior first, then by the head of the business unit, and copied to the finance department. Please reply with exactly 3 paragraphs and separate each paragraph with two new lines. The very 2nd paragraph must start with the word "credit".
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