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Line 81: \| title = Guthrie's problem: new equivalences and rapid reductions \| volume = 154 \| year = 1996~~}}.~~\| doi-access = free }}. {{citation \| last = Eppstein \| first = David Line 155 ⟶ 156: \| title = Graph minors. X. Obstructions to tree-decomposition \| volume = 52 \| year = 1991~~}}.~~\| doi-access = free }}. {{citation \| last1 = St. John \| first1 = Katherine

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