1. Erdkunde   geometry   astronomy   geography   chemistry   Hint Half-n-half Clue   2. Astronomie   botany   astronomy   calculus   psychology   Half-n-half Clue   3. Geologie   chemistry   geology   biology   psychology   Half-n-half Clue   4. Chemie   astronomy   geography   biology   chemistry   Half-n-half Clue   5. Infinitesmalrechnung   calculus   trigonometry   chemistry   zoology   Half-n-half Clue   6. Zoologie   geography   geometry   botany   zoology   Half-n-half Clue   7. Algebra   botany   chemistry   history   algebra   Half-n-half Clue