a-a a-b a-c aaa aab aac aae aag aan aao aas ab- aba abb abc abe abg abn abo abs ac- aca acb acc ace acg acn aco acs aea aeb aec aee aeg aen aeo aes ag- aga agb agc age agg agn ago ags an- ana anb anc ane ang ann ano ans aoa aob aoc aoe aog aon aoo aos as- asa asb asc ase asg asn aso ass baa bab bac bae bag ban bao bas bba bbb bbc bbe bbg bbn bbo bbs bca bcb bcc bce bcg bcn bco bcs be- bea beb bec bee beg ben beo bes bga bgb bgc bge bgg bgn bgo bgs bna bnb bnc bne bng bnn bno bns boa bob boc boe bog bon boo bos bsa bsb bsc bse bsg bsn bso bss c-- caa cab cac cae cag can cao cas cba cbb cbc cbe cbg cbn cbo cbs cca ccb ccc cce ccg ccn cco ccs ce- cea ceb cec cee ceg cen ceo ces cga cgb cgc cge cgg cgn cgo cgs cn- cna cnb cnc cne cng cnn cno cns co- coa cob coc coe cog con coo cos csa csb csc cse csg csn cso css eaa eab eac eae eag ean eao eas eba ebb ebc ebe ebg ebn ebo ebs ec- eca ecb ecc ece ecg ecn eco ecs eea eeb eec eee eeg een eeo ees ega egb egc ege egg egn ego egs en- ena enb enc ene eng enn eno ens eo- eoa eob eoc eoe eog eon eoo eos es- esa esb esc ese esg esn eso ess gaa gab gac gae gag gan gao gas gba gbc gbe gbg gbn gbo gbs gca gcb gcc gce gcg gcn gco gcs ge- gea geb gec gee geg gen geo ges gga ggb ggc ggg ggn ggo ggs gna gnb gnc gne gnn gno gns goa gob goc goe gog gon goo gos gsa gsb gsc gse gsg gsn gso gss naa nab nac nae nag nan nao nas nba nbb nbc nbe nbg nbn nbo nbs nca ncb ncc nce ncg ncn nco ncs ne- nea neb nec nee neg nen neo nes nga ngb ngc nge ngg ngn ngo ngs nna nnb nnc nne nng nnn nno nns no- noa nob noc noe nog non noo nos nsa nsb nsc nse nsg nsn nso nss oaa oab oac oae oag oan oao oas ob- oba obb obc obe obg obn obo obs oc- oca ocb occ ocg ocn oco ocs oea oeb oec oee oeg oen oeo oes oga ogc oge ogg ogn ogo ogs on- ona onb onc one ong onn ono ons oo- ooa oob ooc oog oon ooo oos os- osa osb osc ose osg osn oso oss saa sab sac sae sag san sao sas sba sbb sbc sbe sbg sbn sbo sbs sca scb scc sce scg scn sco scs se- sea seb sec see seg sen seo ses sga sgb sgc sge sgg sgn sgo sgs sna snb snc sne sng snn sno sns soa sob soc soe sog son soo sos ss- ssa ssb ssc sse ssg ssn sso sss