-ic a-a a-b a-c a-i aaa aab aac aag aai aan aao ab- aba abb abc abg abi abn abo ac- aca acb acc acg aci acn aco ag- aga agb agc agg agi agn ago ai- aia aib aic aig aii ain aio an- ana anb anc ang ani ann ano aoa aob aoc aog aoi aon aoo baa bab bac bag bai ban bao bba bbb bbc bbg bbi bbn bbo bca bcb bcc bcg bci bcn bco bga bgb bgc bgg bgi bgn bgo bi- bia bib bic big bii bin bio bna bnb bnc bng bni bnn bno boa bob boc bog boi bon boo c-- caa cab cac cag cai can cao cba cbb cbc cbg cbi cbn cbo cca ccb ccc ccg cci ccn cco cga cgb cgc cgg cgi cgn cgo ci- cia cib cic cig cii cin cio cn- cna cnb cnc cng cni cnn cno co- coa cob coc cog coi con coo gaa gab gac gag gai gan gao gba gbc gbg gbi gbn gbo gca gcb gcc gcg gci gcn gco gga ggb ggc ggg ggi ggn ggo gia gib gic gig gii gin gio gna gnb gnc gni gnn gno goa gob goc gog goi gon goo ia- iaa iab iac iag iai ian iao iba ibb ibc ibg ibi ibn ibo ica icb icc icg ici icn ico iga igb igc igg igi ign igo iia iib iic iii iin iio in- ina inb inc ing ini inn ino io- ioa iob ioc iog ioi ion ioo n-i naa nab nac nag nai nan nao nba nbb nbc nbg nbi nbn nbo nca ncb ncc ncg nci ncn nco nga ngb ngc ngg ngi ngn ngo nia nib nic nig nii nin nio nna nnb nnc nng nni nnn nno no- noa nob noc nog noi non noo o-i oaa oab oac oag oai oan oao ob- oba obb obc obg obi obn obo oc- oca ocb occ ocg oci ocn oco oga ogc ogg ogi ogn ogo oia oib oic oii oin oio on- ona onb onc ong oni onn ono oo- ooa oob ooc oog ooi oon ooo