-hou ffff ffrr fftf fofo fohr foof foot for- foro forr fort foth foto fott four fout froh frot frou fuff fufu fuor fur- furo furr furt futo futu hhhh hhof hoff hofu hoho hoof hoor hoot horo horr hort hoth hoto hotr hott hotu houf hour hout htoh httr huff hufu huhu huor huot huro hurr hurt huru huth huto hutt hutu off- offh offo offr offu ofor ohho ohoh ohto ohtu ooff ooho oooh oooo oort orff orfu oro- orof oror orot orro orth orto otho othr oto- otof otoh otoo otor otro otto ottu otur ouff our- ouro ourt out- outh outo ouu- rhoh roff rofo rohr rohu roof roor root roro rort roru roth roto rotr rott rouf rouh rout rrrr ruff rufo ruft ruhh ruhr ruro ruru ruth ruto rutt rutu tfot thof thoo thor thot thou thro thru thtr thur toff tofo toft tofu toho tohu toof tooh toor toot torf toro torr tort toru toth toto totr tott touh tour tout trfr troo trot trou trtr trut truu ttff tttt tuff tufo tuft tufu tuht tuhu tuor turf turo turr turt turu tuto tutt tutu tuuo uhoh uhuh uofo uor- urff urft urho uro- uroo urrh urth urur urut utfo utor utto uttu uutf uuuu