1. sankakuhou   geometry   trigonometry   geology   calculus   Hint Half-n-half Clue   2. chishitsugaku   geology   philosophy   geometry   biology   Half-n-half Clue   3. tenbungakushya   philosophy   astronomy   algebra   geography   Half-n-half Clue   4. tetsugaku   history   philosophy   physics   biology   Half-n-half Clue   5. bisekibungaku   biology   calculus   physics   botany   Half-n-half Clue   6. doubutsugaku   history   geometry   geology   zoology   Half-n-half Clue   7. butsurigaku   philosophy   physics   algebra   geometry   Half-n-half Clue