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1. Prove that if D is an oriented graph of order 4 such that D - v is strong for every vertex v of D,
1. Prove that if D is an oriented graph of order 4 such that D - v is strong for every vertex v of D, then D is strong.
2. Prove that no oriented graph D of order 4 has the property that D - v is strong for every vertex v of D.
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