1. Chemie   botany   algebra   geography   chemistry   Hint Half-n-half Clue   2. Philosophie   history   philosophy   geography   calculus   Half-n-half Clue   3. Trigonometrie   zoology   calculus   trigonometry   geology   Half-n-half Clue   4. Algebra   chemistry   algebra   biology   botany   Half-n-half Clue   5. Geschichte   botany   geography   physics   history   Half-n-half Clue   6. Astronomie   algebra   astronomy   geography   history   Half-n-half Clue   7. Erdkunde   trigonometry   geography   history   calculus   Half-n-half Clue