-al -ol a-a a-b a-c aaa aab aac aal aao aas aau ab- aba abb abc abl abo abs abu ac- aca acb acc acl aco acs acu al- ala alb alc all alo als alu aoa aob aoc aol aoo aos aou as- asa asb asc asl aso ass asu au- aua aub auc aul auo aus b-u baa bab bac bal bao bas bau bba bbb bbc bbl bbo bbs bbu bca bcb bcc bcl bco bcs bcu bla blb blc bll blo bls blu boa bob boc bol boo bos bou bsa bsb bsc bsl bso bss bsu bua bub buc bul buo bus buu c-- caa cab cac cal cao cas cau cba cbb cbc cbl cbo cbs cbu cca ccb ccc ccl cco ccs ccu cl- cla clb clc cll clo cls clu co- coa cob coc col coo cos cou csa csb csc csl cso css csu cua cub cuc cul cuo cus cuu la- laa lab lac lal lao las lau lba lbb lbc lbl lbo lbs lbu lca lcb lcc lcl lco lcs lcu lla llb llc lll llo lls llu loa lob loc lol loo los lou lsa lsb lsc lsl lso lss lsu lua lub luc lul luo lus luu oaa oab oac oal oao oas oau ob- oba obb obc obl obo obs obu oc- oca ocb occ ocl oco ocs ocu ola olb olc oll olo ols olu oo- ooa oob ooc ool ooo oos os- osa osb osc osl oso oss osu ou- oua ouc oul ouo ous saa sab sac sal sao sas sau sba sbb sbc sbl sbo sbs sbu sca scb scc scl sco scs scu sla slb slc sll slo sls slu soa sob soc sol soo sos sou ss- ssa ssb ssc ssl sso sss ssu sua sub suc sul suo sus suu ua- uaa uab uac ual uao uas uau uba ubb ubc ubl ubo ubs ubu uca ucb ucc ucl uco ucs ucu ula ulb ulc ull ulo uls ulu uoa uob uoc uol uoo uos usa usb usc usl uso uss usu uua uuc uus uuu