a-a a-b a-i aaa aab aad aai aao aap aar ab- aba abb abd abi abo abp abr ad- ada adb add adi ado adp adr ai- aia aib aid aii aio aip air aoa aob aod aoi aoo aop aor ap- apa apb apd api apo app apr ar- ara arb ard ari aro arp arr b-p baa bab bad bai bao bap bar bba bbb bbd bbi bbo bbp bbr bda bdb bdd bdi bdo bdp bdr bi- bia bib bid bii bio bip bir boa bob bod boi boo bop bor bpa bpb bpd bpi bpo bpp bpr bra brb brd bri bro brp brr daa dab dad dai dao dap dar dba dbb dbd dbi dbo dbp dbr dda ddb ddd ddi ddo ddp ddr di- dia dib did dii dio dip dir doa dob dod doi doo dop dor dpa dpb dpd dpi dpo dpp dpr dra drb drd dri dro drp drr i-d ia- iaa iab iad iai iao iap iar iba ibb ibd ibi ibo ibp ibr ida idb idd idi ido idp idr iia iib iid iii iio iip iir io- ioa iob iod ioi ioo iop ior ipa ipb ipd ipi ipo ipp ipr ir- ira irb ird iri iro irp irr o-i oaa oab oad oai oao oap oar ob- oba obb obd obi obo obp obr oda odb odd odi odo odp odr oia oib oid oii oio oip oir oo- ooa oob ood ooi ooo oop oor op- opa opb opd opi opo opp opr or- ora orb ord ori oro orp orr p-p paa pab pad pai pao pap par pba pbb pbd pbi pbo pbp pbr pda pdb pdd pdi pdo pdp pdr pia pib pid pii pio pip pir poa pob pod poi poo pop por ppa ppb ppd ppi ppo ppp ppr pra prb prd pri pro prp prr ra- raa rab rad rai rao rap rar rba rbb rbd rbi rbo rbp rbr rda rdb rdd rdi rdo rdp rdr ria rib rid rii rio rip rir roa rob rod roi roo rop ror rpa rpb rpd rpi rpo rpp rpr rra rrb rrd rri rrp rrr