1. Chemie   algebra   trigonometry   chemistry   philosophy   Hint Half-n-half Clue   2. Philosophie   history   philosophy   biology   algebra   Half-n-half Clue   3. Geschichte   history   geography   trigonometry   zoology   Half-n-half Clue   4. Erdkunde   chemistry   psychology   algebra   geography   Half-n-half Clue   5. Geologie   geology   botany   philosophy   history   Half-n-half Clue   6. Biologie   chemistry   psychology   biology   geometry   Half-n-half Clue   7. Physik   trigonometry   history   physics   geometry   Half-n-half Clue