orig    pre-r   sort-r          pre-e   sort-e          pre-o   sort-O          final

cabin                                                   cabin   copy            copy
prawn   prawn   carpet                                                          carpet
pail                                                    pail    soap            soap
error   error   error                                                           error
reptile reptile prawn                                                           prawn
engine                          engine  emblem                                  emblem
copy                                                    copy   cabin            cabin
echo                            echo    echo                                    echo
soap                                                    soap   pail             pail
eskimo                          eskimo  engine                                  engine
carpet  carpet  reptile                                                         reptile
emblem                          emblem  eskimo                                  eskimo
skunk                                                   skunk  skunk            skunk