sp >                   spell                               spine                              sport

     st >                    start                               standing                         star

     sc >                   scare                              scathe                            scald

     sm >                  smile                              smock                            smooth

     sn >                   snail                               snooker                          snake

     sl >                    slender                           sloop                              slide

     sw >                  swipe                              swell                             Sweden

     tw >                   twine                              twilight                          twin

     dw >                  dwarf                             dwindle                          dwindling

     cr >                   craft                               creature                         crinkle

     gr >                   grow                               ground                           graft

     fr >                   frown                              freedom                         freckle

     thr >                  three                               thrash                             threat

     spr >                 spray                               spread                            sprayed

     bl >                   blend                               blind                               blink

     cl >                   class                               cleaner                           club

     gl >                   glass                               glean                              gloves

     fl >                    flask                               flower                            flotsam

     pr >                   preen                              prate                              pram

     br >                   brilliant                           break                              brown

     tr >                    trailer                             trinket                             trial

     dr >                   drawer                            draw                              drink

     pl >                    plough                            player                             plot

     sq >                   square                            squaw                            squeal

     spl >                   splash                            splendid                          splatter

     shr >                  shrine                             shrink                             shrew

     str >                   straw                             straddle                          strange

     scr >                  scream                          scratch                            screw

      > ks                  box                               rocks                              fix

      > gz                  eggs                              example                          figs