-al -ol a-a a-b a-i aaa aab aaf aai aal aao aar aas ab- aba abb abf abi abl abo abr abs af- afa afb aff afi afl afo afr afs ai- aia aib aif aii ail aio air ais al- ala alb alf ali all alo alr als aoa aob aof aoi aol aoo aor aos ar- ara arb arf ari arl aro arr ars as- asa asb asf asi asl aso asr ass baa bab baf bai bal bao bar bas bba bbb bbf bbi bbl bbo bbr bbs bfa bfb bff bfi bfl bfo bfr bfs bi- bia bib bif bii bil bio bir bis bla blb blf bli bll blo blr bls boa bob bof boi bol boo bor bos bra brb brf bri brl bro brr brs bsa bsb bsf bsi bsl bso bsr bss faa fab faf fai fal fao far fas fba fbb fbf fbi fbl fbo fbr fbs ffa fff ffi ffl ffo ffr ffs fia fib fif fii fil fir fis fla flb flf fli fll flo flr fls foa fob fof foi fol foo for fos fra frb frf fri frl fro frr frs fsa fsb fsf fsi fsl fso fsr fss i-f ia- iaa iab iaf iai ial iao iar ias iba ibb ibf ibi ibl ibo ibr ibs ifa ifb iff ifi ifl ifo ifr ifs iia iib iif iii iil iio iir iis il- ila ilb ilf ili ill ilo ilr ils io- ioa iob iof ioi iol ioo ior ios ir- ira irb irf iri irl iro irr irs is- isa isb isf isi isl iso isr iss la- laa lab laf lai lal lao lar las lba lbb lbf lbi lbl lbo lbr lbs lfa lfb lff lfi lfl lfo lfr lfs lia lib lif lii lil lio lir lis lla llb llf lli lll llo llr lls loa lob lof loi lol loo lor los lra lrb lrf lri lro lrr lrs lsa lsb lsf lsi lsl lso lsr lss o-i oaa oab oaf oai oal oao oar oas ob- oba obb obf obi obl obo obr obs of- ofa ofb off ofi ofl ofo ofr ofs oia oib oif oii oil oio oir ois ola olb olf oli oll olo ols oo- ooa oob oof ooi ool ooo oor oos or- ora orb orf ori orl oro orr ors os- osa osb osf osi osl oso osr oss ra- raa rab raf rai ral rao rar ras rba rbb rbf rbi rbl rbo rbr rbs rfa rfb rff rfi rfl rfo rfr rfs ria rib rif rii ril rio rir ris rla rlf rli rll rlo rlr rls roa rob rof roi rol roo ror ros rra rrb rrf rri rrl rrr rrs rsa rsb rsf rsi rsl rso rsr rss saa sab saf sai sal sao sar sas sba sbb sbf sbi sbl sbo sbr sbs sfa sfb sff sfi sfl sfo sfr sfs sia sib sif sii sil sio sir sis sla slb slf sli sll slo slr sls soa sob sof soi sol soo sor sos sr- sra srb srf sri srl sro srr srs ss- ssa ssb ssf ssi ssl sso ssr sss