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Theorem pre-L2

⊦ pre(gs, ls, L2, a) ↔ (∃ lspmx0. (lspmx0 ≠ ∅ ∧ lspmx0 ⊆ gs.gspmx) ∧ a = chooseL2(lspmx0)) ∨ a = τ ∧ ¬(∃ lspmx0. lspmx0 ≠ ∅ ∧ lspmx0 ⊆ gs.gspmx)