a-a a-b a-i aaa aab aae aag aai aan aao aas ab- aba abb abe abg abi abn abo abs aea aeb aee aeg aei aen aeo aes ag- aga agb age agg agi agn ago ags ai- aia aib aie aig aii ain aio ais an- ana anb ane ang ani ann ano ans aoa aob aoe aog aoi aon aoo aos as- asa asb ase asg asi asn aso ass baa bab bae bag bai ban bao bas bba bbb bbe bbg bbi bbn bbo bbs be- bea beb bee beg bei ben beo bes bga bgb bge bgg bgi bgn bgo bgs bi- bia bib bie big bii bin bio bis bna bnb bne bng bni bnn bno bns boa bob boe bog boi bon boo bos bsa bsb bse bsg bsi bsn bso bss eaa eab eae eag eai ean eao eas eba ebb ebe ebg ebi ebn ebo ebs eea eeb eee eeg een eeo ees ega egb ege egg egi egn ego egs eia eib eie eig eii ein eio eis en- ena enb ene eng eni enn eno ens eo- eoa eob eoe eog eoi eon eoo eos es- esa esb ese esg esi esn eso ess gaa gab gae gag gai gan gao gas gba gbe gbg gbi gbn gbo gbs ge- gea geb gee geg gei gen geo ges gga ggb ggg ggi ggn ggo ggs gia gib gie gig gii gin gio gis gna gnb gne gni gnn gno gns goa gob goe gog goi gon goo gos gsa gsb gse gsg gsi gsn gso gss ia- iaa iab iae iag iai ian iao ias iba ibb ibe ibg ibi ibn ibo ibs ie- iea iee ieg iei ien ies iga igb ige igg igi ign igo igs iia iib iie iii iin iio iis in- ina inb ine ing ini inn ino ins io- ioa iob ioe iog ioi ion ioo ios is- isa isb ise isg isi isn iso iss n-i naa nab nae nag nai nan nao nas nba nbb nbe nbg nbi nbn nbo nbs ne- nea neb nee neg nei nen neo nes nga ngb nge ngg ngi ngn ngo ngs nia nib nie nig nii nin nio nis nna nnb nne nng nni nnn nno nns no- noa nob noe nog noi non noo nos nsa nsb nse nsg nsi nsn nso nss o-i oaa oab oae oag oai oan oao oas ob- oba obb obe obg obi obn obo obs oea oeb oee oeg oei oen oeo oes oga oge ogg ogi ogn ogo ogs oia oib oie oii oin oio ois on- ona onb one ong oni onn ono ons oo- ooa oob oog ooi oon ooo oos os- osa osb ose osg osi osn oso oss saa sab sae sag sai san sao sas sba sbb sbe sbg sbi sbn sbo sbs se- sea seb see seg sei sen seo ses sga sgb sge sgg sgi sgn sgo sgs sia sib sie sig sii sin sio sis sna snb sne sng sni snn sno sns soa sob soe sog soi son soo sos ss- ssa ssb sse ssg ssi ssn sso sss