-ic a-a a-b a-c a-i a-t aaa aab aac aae aai aao aat ab- aba abb abc abe abi abo abt ac- aca acb acc ace aci aco act aea aeb aec aee aei aeo aet ai- aia aib aic aie aii aio ait aoa aob aoc aoe aoi aoo aot at- ata atb atc ate ati ato att baa bab bac bae bai bao bat bba bbb bbc bbe bbi bbo bbt bca bcb bcc bce bci bco bct be- bea beb bec bee bei beo bet bi- bia bib bic bie bii bio bit boa bob boc boe boi boo bot bta btb btc bte bti bto btt c-- caa cab cac cae cai cao cat cba cbb cbc cbe cbi cbo cbt cca ccb ccc cce cci cco cct ce- cea ceb cec cee cei ceo cet ci- cia cib cic cie cii cio cit co- coa cob coc coe coi coo cot cta ctb ctc cte cti cto ctt eaa eab eac eae eai eao eat eba ebb ebc ebe ebi ebo ebt ec- eca ecb ecc ece eci eco ect eea eeb eec eee eeo eet eia eib eic eie eii eio eit eo- eoa eob eoc eoe eoi eoo eot eta etb etc ete eti eto ett ia- iaa iab iac iae iai iao iat iba ibb ibc ibe ibi ibo ibt ica icb icc ice ici ico ict ie- iea iec iee iei iet iia iib iic iie iii iio iit io- ioa iob ioc ioe ioi ioo iot ita itb itc ite iti ito itt o-i oaa oab oac oae oai oao oat ob- oba obb obc obe obi obo obt oc- oca ocb occ oci oco oct oea oeb oec oee oei oeo oet oia oib oic oie oii oio oit oo- ooa oob ooc ooi ooo oot ot- ota otb otc ote oti oto ott taa tab tac tae tai tao tat tba tbb tbc tbe tbi tbo tbt tca tcb tcc tce tci tco tct te- tea teb tec tee tei teo tet tia tib tic tie tii tio tit to- toa tob toc toe toi too tot tta ttb ttc tte tti tto ttt