query: when was the printing press invented by gutenberg?
answers: [ ' T h i s s u g g e s t s t h a t b y 1 4 3 8 G u t e n b e r g a n d D r i t z e h e n h a d i n a l l p r o b a b i l i t y a l r e a d y i n v e n t e d a p r i n t i n g p r o c e s s u s i n g m o v e a b l e t y p e ( s e p a r a t e p i e c e s o f w o o d o r m e t a l f o r e a c h l e t t e r o f t h e a l p h a b e t ) . ' ]