a-a a-b a-i aaa aab aad aae aai aao aap ab- aba abb abd abe abi abo abp ad- ada adb add ade adi ado adp aea aeb aed aee aei aeo aep ai- aia aib aid aie aii aio aip aoa aob aod aoe aoi aoo aop ap- apa apb apd ape api apo app b-p baa bab bad bae bai bao bap bba bbb bbd bbe bbi bbo bbp bda bdb bdd bde bdi bdo bdp be- bea beb bed bee bei beo bep bi- bia bib bid bie bii bio bip boa bob bod boe boi boo bop bpa bpb bpd bpe bpi bpo bpp daa dab dad dae dai dao dap dba dbb dbd dbe dbi dbo dbp dda ddb ddd dde ddi ddo ddp de- dea deb ded dee dei deo dep di- dia dib did die dii dio dip doa dob dod doe doi doo dop dpa dpb dpd dpe dpi dpo dpp eaa eab ead eae eai eao eap eba ebb ebd ebe ebi ebo ebp ed- eda edb edd ede edi edo edp eea eeb eed eee eeo eep eia eib eid eie eii eio eip eo- eoa eob eod eoe eoi eoo eop ep- epa epb epd epe epi epo epp i-d ia- iaa iab iad iae iai iao iap iba ibb ibd ibe ibi ibo ibp ida idb idd ide idi ido idp ie- iea ied iee iei iep iia iib iid iie iii iio iip io- ioa iob iod ioe ioi ioo iop ipa ipb ipd ipe ipi ipo ipp o-i oaa oab oad oae oai oao oap ob- oba obb obd obe obi obo obp oda odb odd ode odi odo odp oea oeb oed oee oei oeo oep oia oib oid oie oii oio oip oo- ooa oob ood ooi ooo oop op- opa opb opd ope opi opo opp p-p paa pab pad pae pai pao pap pba pbb pbd pbe pbi pbo pbp pda pdb pdd pde pdi pdo pdp pea peb ped pee pei peo pep pia pib pid pie pii pio pip poa pob pod poe poi poo pop ppa ppb ppd ppe ppi ppo ppp