-ic a-a a-b a-c a-i aaa aab aac aad aai aao aar aas aau ab- aba abb abc abd abi abo abr abs abu ac- aca acb acc acd aci aco acr acs acu ad- ada adb adc add adi ado adr ads adu ai- aia aib aic aid aii aio air ais aiu aoa aob aoc aod aoi aoo aor aos aou ar- ara arb arc ard ari aro arr ars aru as- asa asb asc asd asi aso asr ass asu au- aua aub auc aud aui auo aur aus b-u baa bab bac bad bai bao bar bas bau bba bbb bbc bbd bbi bbo bbr bbs bbu bca bcb bcc bcd bci bco bcr bcs bcu bda bdb bdc bdd bdi bdo bdr bds bdu bi- bia bib bic bid bii bio bir bis biu boa bob boc bod boi boo bor bos bou bra brb brd bri bro brr brs bru bsa bsb bsc bsd bsi bso bsr bss bsu bua bub buc bud bui buo bur bus buu c-- caa cab cac cad cai cao car cas cau cba cbb cbc cbd cbi cbo cbr cbs cbu cca ccb ccc ccd cci cco ccr ccs ccu cda cdb cdc cdd cdi cdo cdr cds cdu ci- cia cib cic cid cii cio cir cis ciu co- coa cob coc cod coi coo cor cos cou cra crb crc crd cri cro crr crs cru csa csb csc csd csi cso csr css csu cua cub cuc cud cui cuo cur cus cuu daa dab dac dad dai dao dar das dau dba dbb dbc dbd dbi dbo dbr dbs dbu dca dcb dcc dcd dci dco dcr dcs dcu dda ddb ddc ddd ddi ddo ddr dds ddu di- dia dib dic did dii dio dir dis diu doa dob doc dod doi doo dor dos dou dra drb drc drd dri dro drr drs dru dsa dsb dsc dsd dsi dso dsr dss dsu dua dub duc dud dui duo dur dus i-d ia- iaa iab iac iad iai iao iar ias iau iba ibb ibc ibd ibi ibo ibr ibs ibu ica icb icc icd ici ico icr ics icu ida idb idc idd idi ido idr ids idu iia iib iic iid iii iio iir iis iiu io- ioa iob ioc iod ioi ioo ior ios iou ir- ira irb irc ird iri iro irr irs iru is- isa isb isc isd isi iso isr iss isu iu- iua iub iuc iud iui iur ius o-i oaa oab oac oad oai oao oar oas oau ob- oba obb obc obd obi obo obr obs obu oc- oca ocb occ ocd oci oco ocr ocs ocu oda odb odc odd odi odo odr ods odu oia oib oic oid oii oio oir ois oiu oo- ooa oob ooc ood ooi ooo oor oos or- ora orb orc ord ori oro orr ors oru os- osa osb osc osd osi oso osr oss osu ou- oua ouc oud oui ouo our ous ra- raa rab rac rad rai rao rar ras rau rba rbb rbc rbd rbi rbo rbr rbs rbu rca rcb rcc rcd rci rco rcr rcs rcu rda rdb rdc rdd rdi rdo rdr rds rdu ria rib ric rid rii rio rir ris roa rob roc rod roi roo ror ros rou rra rrb rrc rrd rri rrr rrs rru rsa rsb rsc rsd rsi rso rsr rss rsu rua rub ruc rud rui ruo rur rus ruu saa sab sac sad sai sao sar sas sau sba sbb sbc sbd sbi sbo sbr sbs sbu sca scb scc scd sci sco scr scs scu sda sdb sdc sdd sdi sdo sdr sds sdu sia sib sic sid sii sio sir sis siu soa sob soc sod soi soo sor sos sou sr- sra srb src srd sri sro srr srs ss- ssa ssb ssc ssd ssi sso ssr sss ssu sua sub suc sud sui suo sur sus suu ua- uaa uab uac uad uai uao uar uas uau uba ubb ubc ubi ubo ubr ubs ubu uca ucb ucc ucd uci uco ucr ucs ucu uda udb udc udd udi udo udr uds udu uia uib uic uid uii uio uir uis uiu uoa uob uoc uod uoo uor uos ur- ura urb urc urd uri uro urr urs uru usa usb usc usd usi uso usr uss usu uua uuc uur uus uuu