-er -ic a-a a-b a-c a-i aaa aab aac aae aah aai aak aao aar ab- aba abb abc abe abh abi abk abo abr ac- aca acb acc ace ach aci ack aco acr aea aeb aec aee aeh aei aek aeo aer aha ahb ahc ahe ahh ahi ahk aho ahr ai- aia aib aic aie aih aii aik aio air aka akb akc ake akh aki akk ako akr aoa aob aoc aoe aoh aoi aok aoo aor ar- ara arb arc are arh ari ark aro arr baa bab bac bae bah bai bak bao bar bba bbb bbc bbe bbh bbi bbk bbo bbr bca bcb bcc bce bch bci bck bco bcr be- bea beb bec bee beh bei bek beo ber bha bhb bhc bhe bhh bhi bhk bho bhr bi- bia bib bic bie bih bii bik bio bir bka bkb bkc bke bkk bko bkr boa bob boc boe boh boi bok boo bor bra brb bre brh bri brk bro brr c-- caa cab cac cae cah cai cak cao car cba cbb cbc cbe cbh cbi cbk cbo cbr cca ccb ccc cce cch cci cck cco ccr ce- cea ceb cec cee ceh cei cek ceo cer ch- cha chb chc che chh chi chk cho chr ci- cia cib cic cie cih cii cik cio cir cka ckb ckc ckh cki cko co- coa cob coc coe coh coi cok coo cor cra crb crc cre crh cri crk cro crr eaa eab eac eae eah eai eak eao ear eba ebb ebc ebe ebh ebi ebk ebo ebr ec- eca ecb ecc ece ech eci eck eco ecr eea eeb eec eee eek eeo eer eha ehb ehc ehe ehh ehi eho ehr eia eib eic eie eii eik eio eir eka ekb ekc eke ekh eki eko ekr eo- eoa eob eoc eoe eoh eoi eok eoo eor era erb erc ere erh eri erk ero err h-i haa hab hac hae hah hai hak hao har hba hbb hbc hbe hbh hbi hbk hbo hbr hca hcb hcc hce hch hci hck hco hcr he- hea heb hec hee heh hei hek heo her hha hhb hhc hhe hhh hhi hhk hho hhr hia hib hic hie hih hii hik hio hir hka hkb hkh hki hkk hko hkr hoa hob hoc hoe hoh hoi hok hoo hor hr- hra hrb hrc hre hrh hri hrk hro hrr ia- iaa iab iac iae iah iai iao iar iba ibb ibc ibe ibh ibi ibk ibo ibr ica icb icc ice ich ici ick ico icr ie- iea iec iee iei iek ier iha ihb ihc ihe ihh ihi ihk iho ihr iia iib iic iie iih iii iio iir ika ikb ikc ike iki ikk iko ikr io- ioa iob ioc ioe ioh ioi ioo ior ir- ira irb irc ire iri irk iro irr ka- kaa kab kac kae kah kai kak kao kar kba kbb kbc kbe kbh kbi kbk kbo kbr kca kcb kcc kce kch kci kck kcr ke- kea keb kec kee keh kei kek keo ker kha khe khh khi khk kho khr kia kib kic kie kih kii kik kio kir kkb kkc kke kkh kki kkk kkr koa kob koc koe koh koi kok koo kor kra krc kri krk kro krr o-i oaa oab oac oae oah oai oak oao oar ob- oba obb obc obe obh obi obk obo obr oc- oca ocb occ och oci ock oco ocr oea oeb oec oee oeh oei oeo oer oha ohc ohe ohh ohi oho ohr oia oib oic oie oii oik oio oir oka okb okc oke oki okk oko okr oo- ooa oob ooc ooh ooi ook ooo oor or- ora orb orc ore orh ori ork oro orr ra- raa rab rac rae rah rai rak rao rar rba rbb rbc rbe rbh rbi rbk rbo rbr rca rcb rcc rce rch rci rco rcr re- rea reb rec ree reh rei rek reo rer rh- rha rhb rhc rhe rhh rhi rho rhr ria rib ric rie rih rii rik rio rir rkb rkc rke rkk rko roa rob roc roe roh roi rok roo ror rra rrb rrc rrh rri rrk rrr