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197785f | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 | new F β (B β ((A β C β§ B) β ((B β G β§ G) β ((G β C) β (E β§ B β¨ (G β¨ G β (E β G))) β¨ B)))) intro intro intro intro intro left right intro intro cases 5 exact 7 exact 8 |