Solve the following math problem efficiently and clearly:

- For simple problems (2 steps or fewer):
Provide a concise solution with minimal explanation.

- For complex problems (3 steps or more):
Use this step-by-step format:

## Step 1: [Concise description]
[Brief explanation and calculations]

## Step 2: [Concise description]
[Brief explanation and calculations]

...

Regardless of the approach, always conclude with:

Therefore, the final answer is: $oxed{answer}$. I hope it is correct.

Where [answer] is just the final number or expression that solves the problem.

Problem: At Beaumont High School, there are 20 players on the basketball team.  All 20 players are taking at least one of biology or chemistry.  (Biology and chemistry are two different science courses at the school.)  If there are 8 players taking biology and 4 players are taking both sciences, how many players are taking chemistry?
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