-er -ic a-a a-b a-c a-i aaa aab aac aae aai aam aao aar ab- aba abb abc abe abi abm abo abr ac- aca acb acc ace aci acm aco acr aea aeb aec aee aei aem aeo aer ai- aia aib aic aie aii aim aio air ama amb amc ame ami amm amo amr aoa aob aoc aoe aoi aom aoo aor ar- ara arb arc are ari arm aro arr baa bab bac bae bai bam bao bar bba bbb bbc bbe bbi bbm bbo bbr bca bcb bcc bce bci bcm bco bcr be- bea beb bec bee bei bem beo ber bi- bia bib bic bie bii bim bio bir bma bmb bmc bme bmi bmm bmo bmr boa bob boc boe boi bom boo bor bra brb bre bri brm bro brr c-- caa cab cac cae cai cam cao car cba cbb cbc cbe cbi cbm cbo cbr cca ccb ccc cce cci ccm cco ccr ce- cea ceb cec cee cei cem ceo cer ci- cia cib cic cie cii cim cio cir cma cmb cmc cme cmi cmm cmo cmr co- coa cob coc coe coi com coo cor cra crb crc cre cri crm cro crr eaa eab eac eae eai eam eao ear eba ebb ebc ebe ebi ebm ebo ebr ec- eca ecb ecc ece eci ecm eco ecr eea eeb eec eee eem eeo eer eia eib eic eie eii eim eio eir em- ema emb emc eme emi emm emo emr eo- eoa eob eoc eoe eoi eom eoo eor era erb erc ere eri erm ero err ia- iaa iab iac iae iai iam iao iar iba ibb ibc ibe ibi ibm ibo ibr ica icb icc ice ici icm ico icr ie- iea iec iee iei iem ier iia iib iic iie iii iim iio iir im- ima imb imc ime imi imm imo io- ioa iob ioc ioe ioi iom ioo ior ir- ira irb irc ire iri irm iro irr m-o m-r maa mab mac mae mai mam mao mar mba mbb mbc mbe mbi mbm mbo mbr mc- mca mcb mcc mce mci mcm mco mcr mea meb mec mee mei mem meo mer mi- mia mib mic mie mii mim mio mir mma mmb mmc mme mmi mmm mmo mmr moa mob moc moe moi mom moo mor mra mrb mrc mre mri mrm mro mrr o-i oaa oab oac oae oai oam oao oar ob- oba obb obc obe obi obm obo obr oc- oca ocb occ oci ocm oco ocr oea oeb oec oee oei oem oeo oer oia oib oic oie oii oim oio oir om- oma omb omc ome omi omm omo omr oo- ooa oob ooc ooi oom ooo oor or- ora orb orc ore ori orm oro orr ra- raa rab rac rae rai ram rao rar rba rbb rbc rbe rbi rbm rbo rbr rca rcb rcc rce rci rcm rco rcr re- rea reb rec ree rei rem reo rer ria rib ric rie rii rim rio rir rma rmb rmc rme rmi rmm rmo rmr roa rob roc roe roi rom roo ror rra rrb rrc rri rrm rrr