-al -ol a-a a-b a-i aaa aab aai aal aao aap aar aas ab- aba abb abi abl abo abp abr abs ai- aia aib aii ail aio aip air ais al- ala alb ali all alo alp alr als aoa aob aoi aol aoo aop aor aos ap- apa apb api apl apo app apr aps ar- ara arb ari arl aro arp arr ars as- asa asb asi asl aso asp asr ass b-p baa bab bai bal bao bap bar bas bba bbb bbi bbl bbo bbp bbr bbs bi- bia bib bii bil bio bip bir bis bla blb bli bll blo blp blr bls boa bob boi bol boo bop bor bos bpa bpb bpi bpl bpo bpp bpr bps bra brb bri brl bro brp brr brs bsa bsb bsi bsl bso bsp bsr bss ia- iaa iab iai ial iao iap iar ias iba ibb ibi ibl ibo ibp ibr ibs iia iib iii iil iio iip iir iis il- ila ilb ili ill ilo ilp ilr ils io- ioa iob ioi iol ioo iop ior ios ipa ipb ipi ipl ipo ipp ipr ips ir- ira irb iri irl iro irp irr irs is- isa isb isi isl iso isp isr iss l-p la- laa lab lai lal lao lap lar las lba lbb lbi lbl lbo lbp lbr lbs lia lib lii lil lio lip lir lis lla llb lli lll llo llp llr lls loa lob loi lol loo lop lor los lpa lpb lpi lpl lpo lpp lpr lps lra lrb lri lro lrp lrr lrs lsa lsb lsi lsl lso lsp lsr lss o-i oaa oab oai oal oao oap oar oas ob- oba obb obi obl obo obp obr obs oia oib oii oil oio oip oir ois ola olb oli oll olo olp ols oo- ooa oob ooi ool ooo oop oor oos op- opa opb opi opl opo opp opr ops or- ora orb ori orl oro orp orr ors os- osa osb osi osl oso osp osr oss p-p paa pab pai pal pao pap par pas pba pbb pbi pbl pbo pbp pbr pbs pia pib pii pil pio pip pir pis pla plb pli pll plo plp plr pls poa pob poi pol poo pop por pos ppa ppb ppi ppl ppo ppp ppr pps pra prb pri prl pro prp prr prs ps- psa psb psi psl pso psp psr pss ra- raa rab rai ral rao rap rar ras rba rbb rbi rbl rbo rbp rbr rbs ria rib rii ril rio rip rir ris rla rli rll rlo rlp rlr rls roa rob roi rol roo rop ror ros rpa rpb rpi rpl rpo rpp rpr rps rra rrb rri rrl rrp rrr rrs rsa rsb rsi rsl rso rsp rsr rss saa sab sai sal sao sap sar sas sba sbb sbi sbl sbo sbp sbr sbs sia sib sii sil sio sip sir sis sla slb sli sll slo slp slr sls soa sob soi sol soo sop sor sos spa spb spi spl spo spp spr sps sr- sra srb sri srl sro srp srr srs ss- ssa ssb ssi ssl sso ssp ssr sss