-al -ol a-a a-b a-i aaa aab aai aal aao aap aar aax ab- aba abb abi abl abo abp abr abx ai- aia aib aii ail aio aip air aix al- ala alb ali all alo alp alr alx aoa aob aoi aol aoo aop aor aox ap- apa apb api apl apo app apr apx ar- ara arb ari arl aro arp arr arx ax- axa axi axl axo axp axr axx b-p baa bab bai bal bao bap bar bax bba bbb bbi bbl bbo bbp bbr bbx bi- bia bib bii bil bio bip bir bix bla blb bli bll blo blp blr blx boa bob boi bol boo bop bor box bpa bpb bpi bpl bpo bpp bpr bpx bra brb bri brl bro brp brr brx bxb bxi bxl bxo bxx ia- iaa iab iai ial iao iap iar iba ibb ibi ibl ibo ibp ibr ibx iia iib iii iil iio iip iir iix il- ila ilb ili ill ilo ilp ilr ilx io- ioa iob ioi iol ioo iop ior ipa ipb ipi ipl ipo ipp ipr ipx ir- ira irb iri irl iro irp irr irx ixi ixl l-p la- laa lab lai lal lao lap lar lax lba lbb lbi lbl lbo lbp lbr lbx lia lib lii lil lio lip lir lix lla llb lli lll llo llp llr loa lob loi lol loo lop lor lox lpa lpb lpi lpl lpo lpp lpr lpx lra lrb lri lro lrp lrr lxi lxo lxr lxx o-i oaa oab oai oal oao oap oar oax ob- oba obb obi obl obo obp obr obx oia oib oii oil oio oip oir ola olb oli oll olo olp oo- ooa oob ooi ool ooo oop oor oox op- opa opb opi opl opo opp opr opx or- ora orb ori orl oro orp orr orx ox- oxa oxb oxi oxo oxx p-p paa pab pai pal pao pap par pax pba pbb pbi pbl pbo pbp pbr pbx pia pib pii pil pio pip pir pix pla plb pli pll plo plp plr plx poa pob poi pol poo pop por pox ppa ppb ppi ppl ppo ppp ppr ppx pra prb pri prl pro prp prr prx pxl pxr ra- raa rab rai ral rao rap rar rax rba rbb rbi rbl rbo rbp rbr rbx ria rib rii ril rio rip rir rix rla rli rll rlo rlp rlr roa rob roi rol roo rop ror rox rpa rpb rpi rpl rpo rpp rpr rpx rra rrb rri rrl rrp rrr rxp rxr xaa xal xap xar xbl xbr xbx xia xii xio xix xla xlb xli xlr xoa xoi xoo xop xor xox xpa xpb xpl xpo xpp xrx xxi xxl xxo xxp xxx