1. ~D&Q 2. ~D>(~E&~T) 3. (~EvG)>(~E>H) /~E&H 4. ~D 1, simplification 5. ~E&~T 2,4, modus ponens 6. ~E 5, simplification 7. ~EvG 6, addition 8. ~E>H 3,7, modus ponens 9. H 8,6, modus ponens 10. ~E&H 6,9, conjunction Edwin