1. zoology   Erdkunde   Botanik   Zoologie   Algebra   Hint Half-n-half Clue   2. botany   Erdkunde   Zoologie   Botanik   Physik   Half-n-half Clue   3. astronomy   Trigonometrie   Erdkunde   Biologie   Astronomie   Half-n-half Clue   4. trigonometry   Geschichte   Biologie   Erdkunde   Trigonometrie   Half-n-half Clue   5. calculus   Trigonometrie   Infinitesmalrechnung   Botanik   Physik   Half-n-half Clue   6. chemistry   Infinitesmalrechnung   Biologie   Philosophie   Chemie   Half-n-half Clue   7. philosophy   Philosophie   Chemie   Astronomie   Geschichte   Half-n-half Clue