-er -ic a-a a-b a-c a-i aaa aab aac aae aah aai aao aar ab- aba abb abc abe abh abi abo abr ac- aca acb acc ace ach aci aco acr aea aeb aec aee aeh aei aeo aer aha ahb ahc ahe ahh ahi aho ahr ai- aia aib aic aie aih aii aio air aoa aob aoc aoe aoh aoi aoo aor ar- ara arb arc are arh ari aro arr baa bab bac bae bah bai bao bar bba bbb bbc bbe bbh bbi bbo bbr bca bcb bcc bce bch bci bco bcr be- bea beb bec bee beh bei beo ber bha bhb bhc bhe bhh bhi bho bhr bi- bia bib bic bie bih bii bio bir boa bob boc boe boh boi boo bor bra brb bre brh bri bro brr c-- caa cab cac cae cah cai cao car cba cbb cbc cbe cbh cbi cbo cbr cca ccb ccc cce cch cci cco ccr ce- cea ceb cec cee ceh cei ceo cer ch- cha chb chc che chh chi cho chr ci- cia cib cic cie cih cii cio cir co- coa cob coc coe coh coi coo cor cra crb crc cre crh cri cro crr eaa eab eac eae eah eai eao ear eba ebb ebc ebe ebh ebi ebo ebr ec- eca ecb ecc ece ech eci eco ecr eea eeb eec eee eeo eer eha ehb ehc ehe ehh ehi eho ehr eia eib eic eie eii eio eir eo- eoa eob eoc eoe eoh eoi eoo eor era erb erc ere erh eri ero err h-i haa hab hac hae hah hai hao har hba hbb hbc hbe hbh hbi hbo hbr hca hcb hcc hce hch hci hco hcr he- hea heb hec hee heh hei heo her hha hhb hhc hhe hhh hhi hho hhr hia hib hic hie hih hii hio hir hoa hob hoc hoe hoh hoi hoo hor hr- hra hrb hrc hre hrh hri hro hrr ia- iaa iab iac iae iah iai iao iar iba ibb ibc ibe ibh ibi ibo ibr ica icb icc ice ich ici ico icr ie- iea iec iee iei ier iha ihb ihc ihe ihh ihi iho ihr iia iib iic iie iih iii iio iir io- ioa iob ioc ioe ioh ioi ioo ior ir- ira irb irc ire iri iro irr o-i oaa oab oac oae oah oai oao oar ob- oba obb obc obe obh obi obo obr oc- oca ocb occ och oci oco ocr oea oeb oec oee oeh oei oeo oer oha ohc ohe ohh ohi oho ohr oia oib oic oie oii oio oir oo- ooa oob ooc ooh ooi ooo oor or- ora orb orc ore orh ori oro orr ra- raa rab rac rae rah rai rao rar rba rbb rbc rbe rbh rbi rbo rbr rca rcb rcc rce rch rci rco rcr re- rea reb rec ree reh rei reo rer rh- rha rhb rhc rhe rhh rhi rho rhr ria rib ric rie rih rii rio rir roa rob roc roe roh roi roo ror rra rrb rrc rrh rri rrr