-al -ol a-a a-b a-c aaa aab aac aal aao aar aas ab- aba abb abc abl abo abr abs ac- aca acb acc acl aco acr acs al- ala alb alc all alo alr als aoa aob aoc aol aoo aor aos ar- ara arb arc arl aro arr ars as- asa asb asc asl aso asr ass baa bab bac bal bao bar bas bba bbb bbc bbl bbo bbr bbs bca bcb bcc bcl bco bcr bcs bla blb blc bll blo blr bls boa bob boc bol boo bor bos bra brb brl bro brr brs bsa bsb bsc bsl bso bsr bss c-- caa cab cac cal cao car cas cba cbb cbc cbl cbo cbr cbs cca ccb ccc ccl cco ccr ccs cl- cla clb clc cll clo clr cls co- coa cob coc col coo cor cos cra crb crc crl cro crr crs csa csb csc csl cso csr css la- laa lab lac lal lao lar las lba lbb lbc lbl lbo lbr lbs lca lcb lcc lcl lco lcr lcs lla llb llc lll llo llr lls loa lob loc lol loo lor los lra lrb lrc lro lrr lrs lsa lsb lsc lsl lso lsr lss oaa oab oac oal oao oar oas ob- oba obb obc obl obo obr obs oc- oca ocb occ ocl oco ocr ocs ola olb olc oll olo ols oo- ooa oob ooc ool ooo oor oos or- ora orb orc orl oro orr ors os- osa osb osc osl oso osr oss ra- raa rab rac ral rao rar ras rba rbb rbc rbl rbo rbr rbs rca rcb rcc rcl rco rcr rcs rla rlc rll rlo rlr rls roa rob roc rol roo ror ros rra rrb rrc rrl rrr rrs rsa rsb rsc rsl rso rsr rss saa sab sac sal sao sar sas sba sbb sbc sbl sbo sbr sbs sca scb scc scl sco scr scs sla slb slc sll slo slr sls soa sob soc sol soo sor sos sr- sra srb src srl sro srr srs ss- ssa ssb ssc ssl sso ssr sss