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Proof step 1 from proof le-09 (
previous step
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⊦ class1 ≤ class2 ↔ class2 = `java.lang.Object' .class ∨ class1 = class2 ∨ class1 <_1 class2 ∨ (∃ class3. class1 <_1 class3 ∧ class3 ≤ class2)
A spec-lemma