-al a-a a-b a-c aaa aab aac aal aar aas aau ab- aba abb abc abl abr abs abu ac- aca acb acc acl acr acs acu al- ala alb alc all alr als alu ar- ara arb arc arl arr ars aru as- asa asb asc asl asr ass asu au- aua aub auc aul aur aus b-u baa bab bac bal bar bas bau bba bbb bbc bbl bbr bbs bbu bca bcb bcc bcl bcr bcs bcu bla blb blc bll blr bls blu bra brb brl brr brs bru bsa bsb bsc bsl bsr bss bsu bua bub buc bul bur bus buu c-- caa cab cac cal car cas cau cba cbb cbc cbl cbr cbs cbu cca ccb ccc ccl ccr ccs ccu cl- cla clb clc cll clr cls clu cra crb crc crl crr crs cru csa csb csc csl csr css csu cua cub cuc cul cur cus cuu la- laa lab lac lal lar las lau lba lbb lbc lbl lbr lbs lbu lca lcb lcc lcl lcr lcs lcu lla llb llc lll llr lls llu lra lrb lrc lrr lrs lru lsa lsb lsc lsl lsr lss lsu lua lub luc lul lur lus luu ra- raa rab rac ral rar ras rau rba rbb rbc rbl rbr rbs rbu rca rcb rcc rcl rcr rcs rcu rla rlc rll rlr rls rlu rra rrb rrc rrl rrr rrs rru rsa rsb rsc rsl rsr rss rsu rua rub ruc rur rus ruu saa sab sac sal sar sas sau sba sbb sbc sbl sbr sbs sbu sca scb scc scl scr scs scu sla slb slc sll slr sls slu sr- sra srb src srl srr srs ss- ssa ssb ssc ssl ssr sss ssu sua sub suc sul sur sus suu ua- uaa uab uac ual uar uas uau uba ubb ubc ubl ubr ubs ubu uca ucb ucc ucl ucr ucs ucu ula ulb ulc ull ulr uls ulu ur- ura urb urc url urr urs uru usa usb usc usl usr uss usu uua uuc uur uus uuu