-al -ol a-a a-b a-i aaa aab aai aal aao aas ab- aba abb abi abl abo abs ai- aia aib aii ail aio ais al- ala alb ali all alo als aoa aob aoi aol aoo aos as- asa asb asi asl aso ass baa bab bai bal bao bas bba bbb bbi bbl bbo bbs bi- bia bib bii bil bio bis bla blb bli bll blo bls boa bob boi bol boo bos bsa bsb bsi bsl bso bss ia- iaa iab iai ial iao ias iba ibb ibi ibl ibo ibs iia iib iii iil iio iis il- ila ilb ili ill ilo ils io- ioa iob ioi iol ioo ios is- isa isb isi isl iso iss la- laa lab lai lal lao las lba lbb lbi lbl lbo lbs lia lib lii lil lio lis lla llb lli lll llo lls loa lob loi lol loo los lsa lsb lsi lsl lso lss o-i oaa oab oai oal oao oas ob- oba obb obi obl obo obs oia oib oii oil oio ois ola olb oli oll olo ols oo- ooa oob ooi ool ooo oos os- osa osb osi osl oso oss saa sab sai sal sao sas sba sbb sbi sbl sbo sbs sia sib sii sil sio sis sla slb sli sll slo sls soa sob soi sol soo sos ss- ssa ssb ssi ssl sso sss