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What are the 6 Sources of Skepticism?
1) Informal Fallacies
2) Traditions and Customs
3) Common Sense
2 kinds of Justification?
Strong - argument of the opposite is impossible to be the truth
Weak - uses sensory and can highly be possible to be true
Define Contradiction in 3 ways
Quality vs. Quantity
Both cannot be true and both can not be false
all lines are straight
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