1. trigonometria   geometry   algebra   trigonometry   astronomy   Hint Half-n-half Clue   2. storia   philosophy   physics   astronomy   history   Half-n-half Clue   3. geologia   zoology   calculus   geology   philosophy   Half-n-half Clue   4. psicologia   geology   psychology   algebra   chemistry   Half-n-half Clue   5. calcolo   philosophy   geometry   calculus   physics   Half-n-half Clue   6. astronomia   zoology   astronomy   geography   geometry   Half-n-half Clue   7. zoologia   trigonometry   zoology   geography   algebra   Half-n-half Clue