3 problems
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The structural conjecture for sufficiently large minimal-ABC trees
Structural conjecture for large minimal-ABC trees. Enough large minimal-ABC trees are comprised exclusively of -branches and internal vertices.
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The nine-\B_2-branch conjecture for minimal-ABC trees
Nine--branch conjecture. A minimal-ABC tree can contain at most nine -branches.
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The three-\B_1-branch conjecture for minimal-ABC trees
Three--branch conjecture. A minimal-ABC tree can contain at most three -branches.