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Thousands of "bacteria" are easy to obtain, but they are difficult to find

Thousands of "bacteria" are easy to obtain, but they are difficult to find
Thousands of "bacteria" are easy to obtain, but they are difficult to find
Thousands of "bacteria" are easy to obtain, but they are difficult to find
Thousands of "bacteria" are easy to obtain, but they are difficult to find
Thousands of "bacteria" are easy to obtain, but they are difficult to find
Thousands of "bacteria" are easy to obtain, but they are difficult to find