original: the main techniques concerned are woodcut , engraving and etching , although there are others .
simplifications: the main techniques concerned are woodcut , engraving and etching , although there are more . the main methods involved are woodcut , engraving and etching , although there are others . the main techniques are woodcutting , engraving , and etching ; other techniques can be used . the most common methods are woodcut , engraving and etching . the main techniques concerned are woodcut , engraving and etching , although there are others . the main techniques concerned are woodcut , engraving and etching , although there are others . the main techniques concerned are woodcut , engraving and etching , although there are others . the main ways of doing things concerned are woodcut , writing-related and etching , although there are others .