BUTTERFLYING

be bi by ef el en er et fe if in it li ne nu re ti un ut ye

beg bel ben bet bey big bin bit bug bun bur but buy bye eft elf eng erg ern fen fer fet feu fey fib fie fig fil fin fir fit flu fly fry fub fug fun fur gel gen get gey gib gie gin git gnu gul gun gut guy ire leg lei let leu ley lib lie lin lit lug lye neb neg net nib nil nit nub nut reb ref reg rei ret rib rif rig rin rub rue rug run rut rye teg tel ten tet tie til tin tit try tub tug tui tun tut tye urb urn ute yen yet yin

belt bent berg bier bile bine bint birl bite bitt blet blin blue blur bren brie brig brin brit brut bung bunt burg burl burn bury bute butt byre byrl byte enuf etui felt fern file fine fire firn fley flir flit flub flue fret frig frit frug fuel furl fury gelt gent genu gibe gien gift gilt girl girn girt gite glen gley glib glue glut grey grin grit grub grue gulf gybe gyre gyri iglu inby inly left lent lief lien lier lieu life lift line ling lint liny lire lite litu lube luge lune lung lunt luny lure lute lyre neif nett nite nurl reft reif rein rely rent riel rife rift rile ring rite rube ruby ruin rule ruly rune rung runt tent tern tier tile tilt tine ting tint tiny tire tirl tref tret trey trig true trug tube tuft tule tune tung turf turn tyer tyin tyne tyre ugly unbe unit urge yeti yett yule yurt