-er a-a a-b a-i aaa aab aae aag aai aan aao aar ab- aba abb abe abg abi abn abo abr aea aeb aee aeg aei aen aeo aer ag- aga agb age agg agi agn ago agr ai- aia aib aie aig aii ain aio air an- ana anb ane ang ani ann ano anr aoa aob aoe aog aoi aon aoo aor ar- ara arb are arg ari arn aro arr baa bab bae bag bai ban bao bar bba bbb bbe bbg bbi bbn bbo bbr be- bea beb bee beg bei ben beo ber bga bgb bge bgg bgi bgn bgo bgr bi- bia bib bie big bii bin bio bir bna bnb bne bng bni bnn bno bnr boa bob boe bog boi bon boo bor bra brb bre brg bri brn bro brr eaa eab eae eag eai ean eao ear eba ebb ebe ebg ebi ebn ebo ebr eea eeb eee eeg een eeo eer ega egb ege egg egi egn ego egr eia eib eie eig eii ein eio eir en- ena enb ene eng eni enn eno enr eo- eoa eob eoe eog eoi eon eoo eor era erb ere erg eri ern ero err gaa gab gae gag gai gan gao gar gba gbe gbg gbi gbn gbo gbr ge- gea geb gee geg gei gen geo ger gga ggb ggg ggi ggn ggo ggr gia gib gie gig gii gin gio gir gna gnb gne gni gnn gno gnr goa gob goe gog goi gon goo gor gra grb gre grg gri grn gro grr ia- iaa iab iae iag iai ian iao iar iba ibb ibe ibg ibi ibn ibo ibr ie- iea iee ieg iei ien ier iga igb ige igg igi ign igo igr iia iib iie iii iin iio iir in- ina inb ine ing ini inn ino inr io- ioa iob ioe iog ioi ion ioo ior ir- ira irb ire irg iri irn iro irr n-i naa nab nae nag nai nan nao nar nba nbb nbe nbg nbi nbn nbo nbr ne- nea neb nee neg nei nen neo ner nga ngb nge ngg ngi ngn ngo nia nib nie nig nii nin nio nir nna nnb nne nng nni nnn nno no- noa nob noe nog noi non noo nor nra nrb nre nrg nri nrn nro nrr o-i oaa oab oae oag oai oan oao oar ob- oba obb obe obg obi obn obo obr oea oeb oee oeg oei oen oeo oer oga oge ogg ogi ogn ogo oia oib oie oii oin oio oir on- ona onb one ong oni onn ono onr oo- ooa oob oog ooi oon ooo oor or- ora orb ore org ori orn oro orr ra- raa rab rae rag rai ran rao rar rba rbb rbe rbg rbi rbn rbo rbr re- rea reb ree reg rei ren reo rer rga rgb rge rgg rgi rgn rgo rgr ria rib rie rig rii rin rio rir rna rnb rng rni rnn rno rnr roa rob roe rog roi ron roo ror rra rrb rrg rri rrn rrr