-ic a-a a-b a-c a-i aaa aab aac aah aai aao aar ab- aba abb abc abh abi abo abr ac- aca acb acc ach aci aco acr aha ahb ahc ahh ahi aho ahr ai- aia aib aic aih aii aio air aoa aob aoc aoh aoi aoo aor ar- ara arb arc arh ari aro arr baa bab bac bah bai bao bar bba bbb bbc bbh bbi bbo bbr bca bcb bcc bch bci bco bcr bha bhb bhc bhh bhi bho bhr bi- bia bib bic bih bii bio bir boa bob boc boh boi boo bor bra brb brh bri bro brr c-- caa cab cac cah cai cao car cba cbb cbc cbh cbi cbo cbr cca ccb ccc cch cci cco ccr ch- cha chb chc chh chi cho chr ci- cia cib cic cih cii cio cir co- coa cob coc coh coi coo cor cra crb crc crh cri cro crr h-i haa hab hac hah hai hao har hba hbb hbc hbh hbi hbo hbr hca hcb hcc hch hci hco hcr hha hhb hhc hhh hhi hho hhr hia hib hic hih hii hio hir hoa hob hoc hoh hoi hoo hor hr- hra hrb hrc hrh hri hro hrr ia- iaa iab iac iah iai iao iar iba ibb ibc ibh ibi ibo ibr ica icb icc ich ici ico icr iha ihb ihc ihh ihi iho ihr iia iib iic iih iii iio iir io- ioa iob ioc ioh ioi ioo ior ir- ira irb irc iri iro irr o-i oaa oab oac oah oai oao oar ob- oba obb obc obh obi obo obr oc- oca ocb occ och oci oco ocr oha ohc ohh ohi oho ohr oia oib oic oii oio oir oo- ooa oob ooc ooh ooi ooo oor or- ora orb orc orh ori oro orr ra- raa rab rac rah rai rao rar rba rbb rbc rbh rbi rbo rbr rca rcb rcc rch rci rco rcr rh- rha rhb rhc rhh rhi rho rhr ria rib ric rih rii rio rir roa rob roc roh roi roo ror rra rrb rrc rrh rri rrr