-up b-p b-u bbb bbc bbk bbo bbp bbr bbs bbt bbu bcb bcc bck bco bcp bcr bcs bct bcu bkb bkc bkk bko bkp bkr bks bkt bob boc bok boo bop bor bos bot bou bpb bpc bpo bpp bpr bps bpt bpu brb brk bro brp brr brs brt bru bsb bsc bsk bso bsp bsr bss bst bsu btb btc btk bto btp btr bts btt btu bub buc buk buo bup bur bus but buu c-- cbb cbc cbk cbo cbp cbr cbs cbt cbu ccb ccc cck cco ccp ccr ccs cct ccu ckb ckc cko cks ckt co- cob coc cok coo cop cor cos cot cou cpb cpc cpk cpo cpp cpr cps cpt cpu crb crc crk cro crp crr crs crt cru csb csc csk cso csp csr css cst csu ctb ctc ctk cto ctp ctr cts ctt ctu cub cuc cuk cuo cup cur cus cut cuu k-t kbb kbc kbk kbo kbp kbr kbs kbu kcb kcc kck kcp kcr kcs kct kcu kkb kkc kkk kkp kkr kks kkt kku kob koc kok koo kop kor kos kot kou kpc kpk kpo kpp kpr kps kpt kpu krc krk kro krp krr krs krt kru ksb ksc ksk kso ksp ksr kss kst ksu ktb ktc ktk kto ktp ktr kts ktt ktu kub kuc kuk kup kur kus kut kuu ob- obb obc obk obo obp obr obs obt obu oc- ocb occ ock oco ocp ocr ocs oct ocu okb okc okk oko okp okr oks oku oo- oob ooc ook ooo oop oor oos oot op- opb opc opk opo opp opr ops opt or- orb orc ork oro orp orr ors ort oru os- osb osc osk oso osp osr oss ost osu ot- otb otc otk oto otp otr ots ott otu ou- ouc ouk ouo oup our ous out p-p pbb pbc pbk pbo pbp pbr pbs pbt pbu pcb pcc pck pco pcp pcr pcs pct pcu pkb pkc pko pkp pkr pks pkt pku pob poc pok poo pop por pos pot pou ppb ppc ppk ppo ppp ppr pps ppt ppu prb prc prk pro prp prr prs prt pru ps- psb psc psk pso psp psr pss pst psu pt- ptb ptc ptk pto ptp ptr pts ptt ptu pub puc puk pup pur pus put puu rbb rbc rbk rbo rbp rbr rbs rbt rbu rcb rcc rco rcp rcr rcs rct rcu rkb rkc rkk rko rkp rks rkt rku rob roc rok roo rop ror ros rot rou rpb rpc rpk rpo rpp rpr rps rpt rpu rrb rrc rrk rrp rrr rrs rrt rru rsb rsc rsk rso rsp rsr rss rst rsu rtb rtc rtk rto rtp rtr rts rtt rtu rub ruc ruk ruo rup rur rus rut ruu sbb sbc sbk sbo sbp sbr sbs sbt sbu scb scc sck sco scp scr scs sct scu sk- skb skc skk sko skp skr sks skt sku sob soc sok soo sop sor sos sot sou spb spc spk spo spp spr sps spt spu sr- srb src srk sro srp srr srs srt ss- ssb ssc ssk sso ssp ssr sss sst ssu stb stc stk sto stp str sts stt stu sub suc suk suo sup sur sus sut suu tbb tbc tbk tbo tbp tbr tbs tbt tbu tcb tcc tck tco tcp tcr tcs tct tcu tkb tkc tkk tko tkp tkr tks tkt to- tob toc tok too top tor tos tot tou tpb tpc tpk tpo tpp tpr tps tpt tpu trb trc trk tro trp trr trs trt tru tsb tsc tsk tso tsp tsr tss tst tsu ttb ttc ttk tto ttp ttr tts ttt ttu tub tuc tuk tuo tup tur tus tut tuu ubb ubc ubk ubo ubp ubr ubs ubt ubu ucb ucc uck uco ucp ucr ucs uct ucu ukb ukc ukk ukp ukr uku uob uoc uok uoo uop uor uos uot up- upb upc upk upo upp upr ups upt upu ur- urb urc urk uro urp urr urs urt uru usb usc usk uso usp usr uss ust usu utb utc utk uto utp utr uts utt utu uuc uur uus uut uuu

-ous bbbb bbbs bbpr bbrc bcbc bcbp bcbs bccc bccs bcor bcos bcpp bcps bcrs bcru bcsc bcss bctc bcts bcuc bcup bkpr bkpt bksp bobb bobo bobs bobu bock boco bocs bocu boko boks boku boob booc book boop boor boos boot bopp bops bor- bork boro borr bors bort boru bosc bosk boso boss bost bosu botb boto bots bott bouk boup bour bous bout bpcp bpot bprc bpsu brcb brkb brob broc brok broo bror bros brot brou brrr brrs brsb brsr brst brtc bruc brup brus brut bscp bscs bskt bsos bspp bspr bssc bsts bsup btbp btcc btcs btob btor btps btrc btrt btss bttb btus bubb bubo bubs bubu bucc buck buco bucs bucu bukk buko buku bupc bups bur- burb burk buro burp burr burs burt buru busc busk buss bust busu but- buto buts butt buus c-bo cbbc cbbs cbcc cbcp cbcr cbcs cbct cbcu cbko cbkr cbot cbpc cbpp cbrt cbsc cbtc cbus ccbc cccb cccc cccp cccs cccu ccob ccoc ccpp ccpr ccps ccrc ccrp ccrs ccrt ccsp ccss ccst cctb cctc cctt ccuc ccup ccus ccut ckbc ckck ckco ckcs ckob ckoc ckoo ckor ckos ckot ckpc ckpr ckrc cksb ckso ckst cktb ckts cobb cobo cobs cobu cock coco cocp coct cocu cok- coko coob cook coop coos coot copo copp copr cops copt cor- corb corc cork coro corp corr cors cort cosc coso cosp coss cost cotb cotc coto cots cott cotu coub couk coup cour cous cout cpbc cpcs cpcu cpos cpps cprs cprt cpsc cpsk cpso cpsr cpsu cptp cptr cpts cpus crbc crbu crcc crcr crkc crkp crob croc crok croo crop cror crot