bbbb bbdd bbeb bbet bebb bebe bede bedu beeb beed beep beet bete bett betu btbp btdt bttb bubb bube bubu budb budd bude budu bueu but- bute butt dbpd dbtt dddd ddub debe debt debu dedd dede dedu deeb deed deep deet depe depp dept dete deue deut dpdt dtdp dted dttp dub- dubb dube dubu dudd dude dudu duet dupe dute dutp duut ebed edde eddp ede- edup eede eedu eeee eete eetu epee eppp epte epub etee ette ettu eude pbed ped- pede peed peep peet pepd pepe pete pett peut pppd pppp pptt ptpd pu-e pube pubu pudu pued puet pueu pupe pupu put- pute putt putu tbtp tddb tebu tedd tede teed teet tepe tepp tepu tete tett tetu teut tpdu tped tppd tppp tpte tptp tput ttbb tttt tubb tube tubu tude tudu tuet tupe tupu tute tutt tutu ubbe ubet ubud udet udpd upbe uped uppe uppp uppu upup utep utpd uttu uuuu