1 The Invariance Principle 2 Coloring Proofs 3 The Extremal Principle 4 The Box Principle 5 Enumerative Combinatorics 6 Number Theory 7 Inequalities 8 The Induction Principle 9 Sequences 10 Polynomials 11 Functional Equations 12 Geometry 13 Games 14 Further Strategies

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