-ic a-a a-b a-c a-i a-t aaa aab aac aaf aai aao aat aay ab- aba abb abc abf abi abo abt aby ac- aca acb acc acf aci aco act acy af- afa afb afc aff afi afo aft afy ai- aia aib aic aif aii aio ait aiy aoa aob aoc aof aoi aoo aot at- ata atb atc atf ati ato att ay- aya ayc ayf ayi ayo ayt baa bab bac baf bai bao bat bay bba bbb bbc bbf bbi bbo bbt bby bca bcb bcc bcf bci bco bct bcy bfa bfb bfc bff bfi bfo bft bfy bi- bia bib bic bif bii bio bit biy boa bob boc bof boi boo bot boy bta btb btc btf bti bto btt bty by- bya byc byf byi byo byt c-- caa cab cac caf cai cao cat cay cba cbb cbc cbf cbi cbo cbt cby cca ccb ccc ccf cci cco cct cfa cfb cfc cff cfi cfo cft ci- cia cib cic cif cii cio cit co- coa cob coc cof coi coo cot coy cta ctb ctc ctf cti cto ctt cty cya cyb cyc cyf cyo cyt faa fab fac faf fai fao fat fay fba fbb fbc fbf fbi fbo fbt fca fcb fcc fcf fci fco fct fcy ffa ffc fff ffi ffo fft ffy fia fib fic fif fii fit foa fob foc fof foi foo fot foy fta ftb ftc ftf fti fto ftt fty fy- fya fyb fyc fyi fyo i-f ia- iaa iab iac iaf iai iao iat iba ibb ibc ibf ibi ibo ibt iby ica icb icc icf ici ico ict icy ifa ifb ifc iff ifi ifo ift ify iia iib iic iif iii iio iit io- ioa iob ioc iof ioi ioo iot ita itb itc itf iti ito itt ity iya iyc iyo iyt iyy o-i oaa oab oac oaf oai oao oat ob- oba obb obc obf obi obo obt oby oc- oca ocb occ ocf oci oco oct of- ofa ofb ofc off ofi ofo oft oia oib oic oif oii oio oit oo- ooa oob ooc oof ooi ooo oot ot- ota otb otc otf oti oto ott oya oyi oyo taa tab tac taf tai tao tat tay tba tbb tbc tbf tbi tbo tbt tca tcb tcc tcf tci tco tct tfa tfb tfc tff tfi tfo tft tia tib tic tif tii tio tit tiy to- toa tob toc tof toi too tot toy tta ttb ttc ttf tti tto ttt tty tya tyc tyf tyo tyt yaa yab yac yaf yai yao yat yay ybc ybf ybi yby yca ycc ycf yci yco ycy yfa yfc yff yft yif yii yio yit yob yoc yof yoi yoo yot yoy yta ytc ytf yto ytt yyb yyc yyf yyt yyy