a-a a-b a-i aaa aab aae aag aai aan aao ab- aba abb abe abg abi abn abo aea aeb aee aeg aei aen aeo ag- aga agb age agg agi agn ago ai- aia aib aie aig aii ain aio an- ana anb ane ang ani ann ano aoa aob aoe aog aoi aon aoo baa bab bae bag bai ban bao bba bbb bbe bbg bbi bbn bbo be- bea beb bee beg bei ben beo bga bgb bge bgg bgi bgn bgo bi- bia bib bie big bii bin bio bna bnb bne bng bni bnn bno boa bob boe bog boi bon boo eaa eab eae eag eai ean eao eba ebb ebe ebg ebi ebn ebo eea eeb eee eeg een eeo ega egb ege egg egi egn ego eia eib eie eig eii ein eio en- ena enb ene eng eni enn eno eo- eoa eob eoe eog eoi eon eoo gaa gab gae gag gai gan gao gba gbe gbg gbi gbn gbo ge- gea geb gee geg gei gen geo gga ggb ggg ggi ggn ggo gia gib gie gig gii gin gio gna gnb gne gni gnn gno goa gob goe gog goi gon goo ia- iaa iab iae iag iai ian iao iba ibb ibe ibg ibi ibn ibo ie- iea iee ieg iei ien iga igb ige igg igi ign igo iia iib iie iii iin iio in- ina inb ine ing ini inn ino io- ioa iob ioe iog ioi ion ioo n-i naa nab nae nag nai nan nao nba nbb nbe nbg nbi nbn nbo ne- nea neb nee neg nei nen neo nga ngb nge ngg ngi ngn ngo nia nib nie nig nii nin nio nna nnb nne nng nni nnn nno no- noa nob noe nog noi non noo o-i oaa oab oae oag oai oan oao ob- oba obb obe obg obi obn obo oea oeb oee oeg oei oen oeo oga oge ogg ogi ogn ogo oia oib oie oii oin oio on- ona onb one ong oni onn ono oo- ooa oob oog ooi oon ooo