-ic a-a a-b a-c a-i aaa aab aac aae aag aai aao ab- aba abb abc abe abg abi abo ac- aca acb acc ace acg aci aco aea aeb aec aee aeg aei aeo ag- aga agb agc age agg agi ago ai- aia aib aic aie aig aii aio aoa aob aoc aoe aog aoi aoo baa bab bac bae bag bai bao bba bbb bbc bbe bbg bbi bbo bca bcb bcc bce bcg bci bco be- bea beb bec bee beg bei beo bga bgb bgc bge bgg bgi bgo bi- bia bib bic bie big bii bio boa bob boc boe bog boi boo c-- caa cab cac cae cag cai cao cba cbb cbc cbe cbg cbi cbo cca ccb ccc cce ccg cci cco ce- cea ceb cec cee ceg cei ceo cga cgb cgc cge cgg cgi cgo ci- cia cib cic cie cig cii cio co- coa cob coc coe cog coi coo eaa eab eac eae eag eai eao eba ebb ebc ebe ebg ebi ebo ec- eca ecb ecc ece ecg eci eco eea eeb eec eee eeg eeo ega egb egc ege egg egi ego eia eib eic eie eig eii eio eo- eoa eob eoc eoe eog eoi eoo gaa gab gac gae gag gai gao gba gbc gbe gbg gbi gbo gca gcb gcc gce gcg gci gco ge- gea geb gec gee geg gei geo gga ggb ggc ggg ggi ggo gia gib gic gie gig gii gio goa gob goc goe gog goi goo ia- iaa iab iac iae iag iai iao iba ibb ibc ibe ibg ibi ibo ica icb icc ice icg ici ico ie- iea iec iee ieg iei iga igb igc ige igg igi igo iia iib iic iie iii iio io- ioa iob ioc ioe iog ioi ioo o-i oaa oab oac oae oag oai oao ob- oba obb obc obe obg obi obo oc- oca ocb occ ocg oci oco oea oeb oec oee oeg oei oeo oga ogc oge ogg ogi ogo oia oib oic oie oii oio oo- ooa oob ooc oog ooi ooo