a-a a-b a-c aaa aab aac aam aan aar aas aau ab- aba abb abc abm abn abr abs abu ac- aca acb acc acm acn acr acs acu ama amb amc amm amn amr ams amu an- ana anb anc anm ann anr ans anu ar- ara arb arc arm arn arr ars aru as- asa asb asc asm asn asr ass asu au- aua aub auc aum aun aur aus b-u baa bab bac bam ban bar bas bau bba bbb bbc bbm bbn bbr bbs bbu bca bcb bcc bcm bcn bcr bcs bcu bma bmb bmc bmm bmn bmr bms bmu bna bnb bnc bnn bnr bns bnu bra brb brm brn brr brs bru bsa bsb bsc bsm bsn bsr bss bsu bua bub buc bum bun bur bus buu c-- caa cab cac cam can car cas cau cba cbb cbc cbm cbn cbr cbs cbu cca ccb ccc ccm ccn ccr ccs ccu cma cmb cmc cmm cmn cmr cms cmu cn- cna cnb cnc cnm cnn cnr cns cnu cra crb crc crm crn crr crs cru csa csb csc csm csn csr css csu cua cub cuc cum cun cur cus cuu m-r maa mab mac mam man mar mas mau mba mbb mbc mbm mbr mbs mbu mc- mca mcb mcc mcm mcn mcr mcs mcu mma mmb mmc mmm mmn mmr mms mmu mna mnb mnc mnm mnn mnr mns mnu mra mrb mrc mrm mrn mrr mrs mru msa msb msc msm msn msr mss msu mua mub muc mum mun mur mus muu naa nab nac nam nan nar nas nau nba nbb nbc nbm nbn nbr nbs nbu nca ncb ncc ncm ncn ncr ncs ncu nma nmb nmc nmm nmn nmr nms nmu nna nnb nnc nnm nnn nns nnu nra nrb nrc nrm nrn nrr nrs nru nsa nsb nsc nsm nsn nsr nss nsu nua nub nuc num nun nur nus nuu ra- raa rab rac ram ran rar ras rau rba rbb rbc rbm rbn rbr rbs rbu rca rcb rcc rcm rcn rcr rcs rcu rma rmb rmc rmm rmn rmr rms rna rnb rnc rnm rnn rnr rns rnu rra rrb rrc rrm rrn rrr rrs rru rsa rsb rsc rsm rsn rsr rss rsu rua rub ruc rum run rur rus ruu saa sab sac sam san sar sas sau sba sbb sbc sbm sbn sbr sbs sbu sca scb scc scm scn scr scs scu sma smb smc smm smn smr sms smu sna snb snc snm snn snr sns snu sr- sra srb src srm srn srr srs ss- ssa ssb ssc ssm ssn ssr sss ssu sua sub suc sum sun sur sus suu ua- uaa uab uac uam uan uar uas uau uba ubb ubc ubn ubr ubs ubu uca ucb ucc ucm ucn ucr ucs ucu um- uma umb umc umm umn umr ums umu un- una unb unc unm unn unr uns unu ur- ura urb urc urm urn urr urs uru usa usb usc usm usn usr uss usu uua uuc uum uun uur uus uuu