-al -ol a-a a-b a-c aaa aab aac aad aal aao aau ab- aba abb abc abd abl abo abu ac- aca acb acc acd acl aco acu ad- ada adb adc add adl ado adu al- ala alb alc ald all alo alu aoa aob aoc aod aol aoo aou au- aua aub auc aud aul auo b-u baa bab bac bad bal bao bau bba bbb bbc bbd bbl bbo bbu bca bcb bcc bcd bcl bco bcu bda bdb bdc bdd bdl bdo bdu bla blb blc bld bll blo blu boa bob boc bod bol boo bou bua bub buc bud bul buo buu c-- caa cab cac cad cal cao cau cba cbb cbc cbd cbl cbo cbu cca ccb ccc ccd ccl cco ccu cda cdb cdc cdd cdl cdo cdu cl- cla clb clc cld cll clo clu co- coa cob coc cod col coo cou cua cub cuc cud cul cuo cuu daa dab dac dad dal dao dau dba dbb dbc dbd dbl dbo dbu dca dcb dcc dcd dcl dco dcu dda ddb ddc ddd ddl ddo ddu dl- dla dlb dlc dld dll dlo dlu doa dob doc dod dol doo dou dua dub duc dud dul duo la- laa lab lac lad lal lao lau lba lbb lbc lbd lbl lbo lbu lca lcb lcc lcd lcl lco lcu lda ldb ldc ldd ldl ldo ldu lla llb llc lld lll llo llu loa lob loc lod lol loo lou lua lub luc lud lul luo luu oaa oab oac oad oal oao oau ob- oba obb obc obd obl obo obu oc- oca ocb occ ocd ocl oco ocu oda odb odc odd odl odo odu ola olb olc old oll olo olu oo- ooa oob ooc ood ool ooo ou- oua ouc oud oul ouo ua- uaa uab uac uad ual uao uau uba ubb ubc ubl ubo ubu uca ucb ucc ucd ucl uco ucu uda udb udc udd udl udo udu ula ulb ulc uld ull ulo ulu uoa uob uoc uod uol uoo uua uuc uuu