-al -ol a-a a-b a-i aaa aab aai aal aao aar ab- aba abb abi abl abo abr ai- aia aib aii ail aio air al- ala alb ali all alo alr aoa aob aoi aol aoo aor ar- ara arb ari arl aro arr baa bab bai bal bao bar bba bbb bbi bbl bbo bbr bi- bia bib bii bil bio bir bla blb bli bll blo blr boa bob boi bol boo bor bra brb bri brl bro brr ia- iaa iab iai ial iao iar iba ibb ibi ibl ibo ibr iia iib iii iil iio iir il- ila ilb ili ill ilo ilr io- ioa iob ioi iol ioo ior ir- ira irb iri irl iro irr la- laa lab lai lal lao lar lba lbb lbi lbl lbo lbr lia lib lii lil lio lir lla llb lli lll llo llr loa lob loi lol loo lor lra lrb lri lro lrr o-i oaa oab oai oal oao oar ob- oba obb obi obl obo obr oia oib oii oil oio oir ola olb oli oll olo oo- ooa oob ooi ool ooo oor or- ora orb ori orl oro orr ra- raa rab rai ral rao rar rba rbb rbi rbl rbo rbr ria rib rii ril rio rir rla rli rll rlo rlr roa rob roi rol roo ror rra rrb rri rrl rrr