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Solve the problem.
-How many different vertical arrangements are there of 9 flags if 4 are white, 3 are blue, and 2 are red?
Histology
The examination of tissues and organs at the microscopic level to understand their structure.
Tissue Specimen
A sample of tissue taken for medical examination or study to understand diseases or conditions.
Frozen
The state of a substance being solidified by low temperatures.
Organ System
A group of organs that work together to perform one or more functions in the body, such as the digestive system, the respiratory system, or the circulatory system.
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