-al -ol a-a a-b a-i aaa aab aai aal aao aar aax ab- aba abb abi abl abo abr abx ai- aia aib aii ail aio air aix al- ala alb ali all alo alr alx aoa aob aoi aol aoo aor aox ar- ara arb ari arl aro arr arx ax- axa axi axl axo axr axx baa bab bai bal bao bar bax bba bbb bbi bbl bbo bbr bbx bi- bia bib bii bil bio bir bix bla blb bli bll blo blr blx boa bob boi bol boo bor box bra brb bri brl bro brr brx bxb bxi bxl bxo bxx ia- iaa iab iai ial iao iar iba ibb ibi ibl ibo ibr ibx iia iib iii iil iio iir iix il- ila ilb ili ill ilo ilr ilx io- ioa iob ioi iol ioo ior ir- ira irb iri irl iro irr irx ixi ixl la- laa lab lai lal lao lar lax lba lbb lbi lbl lbo lbr lbx lia lib lii lil lio lir lix lla llb lli lll llo llr loa lob loi lol loo lor lox lra lrb lri lro lrr lxi lxo lxr lxx o-i oaa oab oai oal oao oar oax ob- oba obb obi obl obo obr obx oia oib oii oil oio oir ola olb oli oll olo oo- ooa oob ooi ool ooo oor oox or- ora orb ori orl oro orr orx ox- oxa oxb oxi oxo oxx ra- raa rab rai ral rao rar rax rba rbb rbi rbl rbo rbr rbx ria rib rii ril rio rir rix rla rli rll rlo rlr roa rob roi rol roo ror rox rra rrb rri rrl rrr rxr xaa xal xar xbl xbr xbx xia xii xio xix xla xlb xli xlr xoa xoi xoo xor xox xrx xxi xxl xxo xxx