-al -ol a-a a-b a-c aaa aab aac aad aak aal aao aar ab- aba abb abc abd abk abl abo abr ac- aca acb acc acd ack acl aco acr ad- ada adb adc add adk adl ado adr aka akb akc akd akk akl ako akr al- ala alb alc ald alk all alo alr aoa aob aoc aod aok aol aoo aor ar- ara arb arc ard ark arl aro arr baa bab bac bad bak bal bao bar bba bbb bbc bbd bbk bbl bbo bbr bca bcb bcc bcd bck bcl bco bcr bda bdb bdc bdd bdk bdl bdo bdr bka bkb bkc bkk bkl bko bkr bla blb blc bld blk bll blo blr boa bob boc bod bok bol boo bor bra brb brd brk brl bro brr c-- caa cab cac cad cak cal cao car cba cbb cbc cbd cbk cbl cbo cbr cca ccb ccc ccd cck ccl cco ccr cda cdb cdc cdd cdk cdl cdo cdr cka ckb ckc ckd cko cl- cla clb clc cld clk cll clo clr co- coa cob coc cod cok col coo cor cra crb crc crd crk crl cro crr daa dab dac dad dak dal dao dar dba dbb dbc dbd dbk dbl dbo dbr dca dcb dcc dcd dck dcl dco dcr dda ddb ddc ddd ddk ddl ddo ddr dka dkb dkc dkk dkl dko dkr dl- dla dlb dlc dld dlk dll dlo dlr doa dob doc dod dok dol doo dor dra drb drc drd drk drl dro drr ka- kaa kab kac kad kak kal kao kar kba kbb kbc kbd kbk kbl kbo kbr kca kcb kcc kcd kck kcl kcr kda kdb kdc kdk kdl kdo kdr kkb kkc kkk kkl kkr kl- kla klb klc kld klo klr koa kob koc kod kok kol koo kor kra krc krd krk krl kro krr la- laa lab lac lad lak lal lao lar lba lbb lbc lbd lbk lbl lbo lbr lca lcb lcc lcd lck lcl lco lcr lda ldb ldc ldd ldk ldl ldo ldr lka lkb lkl lkr lla llb llc lld llk lll llo llr loa lob loc lod lok lol loo lor lra lrb lrc lrd lrk lro lrr oaa oab oac oad oak oal oao oar ob- oba obb obc obd obk obl obo obr oc- oca ocb occ ocd ock ocl oco ocr oda odb odc odd odl odo odr oka okb okc okd okk okl oko okr ola olb olc old olk oll olo oo- ooa oob ooc ood ook ool ooo oor or- ora orb orc ord ork orl oro orr ra- raa rab rac rad rak ral rao rar rba rbb rbc rbd rbk rbl rbo rbr rca rcb rcc rcd rcl rco rcr rda rdb rdc rdd rdl rdo rdr rkb rkc rkk rko rla rlc rld rll rlo rlr roa rob roc rod rok rol roo ror rra rrb rrc rrd rrk rrl rrr