P(A or B) = P(A) + P(B) - P(A and B)
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'''
+-----------------------------------------+
| |
| /---------------- |
| | | |
| | A | |
| | /-------------------- |
| | | A | | |
| | | and | B | |
| | | B | | |
| | | | | |
| ----------|-----/ | |
| | | |
| | | |
| --------------------/ |
| |
+-----------------------------------------+
'''
|
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