the textual history can then be represented thus : tuor a ( original 1916-17 text in pencil ) heavily revised and in the later parts entirely overwritten tuor b ( fair copy ) minor stylistic revisions ( and changes to names ) tuor c ( typescript ; does not extend far ; minor stylistic changes ) further alterations mainly on inserted slips ( and further changes to names ) before reading it at exeter college in 1920 ( the text in this book ) .