bbbb bbpr bbrg bibb bibi bigb bigg bigt bigu bipp bipu birb birg biri birr birt biru bitt bitu bpti brig brit brrr brug brup brut btbp btrt bttb bubb bubi bubu bugg bugi buir buit buiu bur- burb burg buri burp burr burt buru but- buti butt ggbt gggg gibb gigg gigi gipi gipp girg giri girr girt giru giur gpgp gpip gprp grbr grib grig grip grit grrr grub grug grui grur grut gtbr gtip gubb gubi gubu gugb gugg gugi gugu guib gurb gurg guri gurr gurt guru guti gutt gutu ibri ibtb igri iiii iiit iitr iitt ippr ipri ipur iput irbp iri- irig irip irri irti irtp itri itup itur iuiu iupp pgib pgpu pgup pibb pibi pigb pigg pigp pigt pigu piip pipi pipp pirg piri pirr piru piti pitr pitt pitu ppgi ppib ppig pppp ppru pptt ppur pri- prig prii prri prti prtp prtr prut pruu ptui pubu pugu puig puir puit puiu pupi pupu pur- purb purg puri purp purr puru put- puti putt putu rbbb rbbr rgbi rgit rgtr rib- ribu rigg rigi rigu ripi ripp ripr ript riri riti ritt ritu rpii rrrr rttp rubb rubi rubp rubu rugg rugi ruit rupp rupt ruri rurp ruru ruti rutt rutu tbit tbrb tbtp tibi tibu tigi tigr tiit tiiu tip- tipi tipp tipt tipu tirb tiri tirr tiru titi titp titt titu tpbg tpir tppp tppr tptp tptr tput tri- trib trig trip trit trpg trpp trtr trub trug trut truu ttbb tttt tubb tubr tubu tugg tugu tuig tuit tuiu tupi tupu turb turg turi turp turr turt turu tuti tutt tutu u-rp ubbi ubii ubir ubit uggt ugri ugur uguu uipi uirr uppp uppu upri upup urbi urgi urgu urib uriu urri urup urur urut utri utti uttu utug uuri uuuu