a-a a-b a-c aaa aab aac aad aae aag aan aao ab- aba abb abc abd abe abg abn abo ac- aca acb acc acd ace acg acn aco ad- ada adb adc add ade adg adn ado aea aeb aec aed aee aeg aen aeo ag- aga agb agc agd age agg agn ago an- ana anb anc and ane ang ann ano aoa aob aoc aod aoe aog aon aoo baa bab bac bad bae bag ban bao bba bbb bbc bbd bbe bbg bbn bbo bca bcb bcc bcd bce bcg bcn bco bda bdb bdc bdd bde bdg bdo be- bea beb bec bed bee beg ben beo bga bgb bgc bgd bge bgg bgn bgo bna bnb bnc bnd bne bng bnn bno boa bob boc bod boe bog bon boo c-- caa cab cac cad cae cag can cao cba cbb cbc cbd cbe cbg cbn cbo cca ccb ccc ccd cce ccg ccn cco cda cdb cdc cdd cde cdg cdn cdo ce- cea ceb cec ced cee ceg cen ceo cga cgb cgc cgd cge cgg cgn cgo cn- cna cnb cnc cnd cne cng cnn cno co- coa cob coc cod coe cog con coo daa dab dac dad dae dag dan dao dba dbb dbc dbd dbe dbg dbn dbo dca dcb dcc dcd dce dcg dcn dco dda ddb ddc ddd dde ddg ddn ddo de- dea deb dec ded dee deg den deo dga dgc dgd dge dgg dgn dna dnb dnc dnd dne dng dnn dno doa dob doc dod doe dog don doo eaa eab eac ead eae eag ean eao eba ebb ebc ebd ebe ebg ebn ebo ec- eca ecb ecc ecd ece ecg ecn eco ed- eda edb edc edd ede edg edn edo eea eeb eec eed eee eeg een eeo ega egb egc egd ege egg egn ego en- ena enb enc end ene eng enn eno eo- eoa eob eoc eod eoe eog eon eoo g-d gaa gab gac gad gae gag gan gao gba gbc gbd gbe gbg gbn gbo gca gcb gcc gcd gce gcg gcn gco gda gdb gdc gdd gde gdn gdo ge- gea geb gec ged gee geg gen geo gga ggb ggc ggd ggg ggn ggo gna gnb gnc gnd gne gnn gno goa gob goc god goe gog gon goo naa nab nac nad nae nag nan nao nba nbb nbc nbd nbe nbg nbn nbo nca ncb ncc ncd nce ncg ncn nco nda ndb ndc ndd nde ndg ndn ndo ne- nea neb nec ned nee neg nen neo nga ngb ngc ngd nge ngg ngn ngo nna nnb nnc nne nng nnn nno no- noa nob noc nod noe nog non noo oaa oab oac oad oae oag oan oao ob- oba obb obc obd obe obg obn obo oc- oca ocb occ ocd ocg ocn oco oda odb odc odd ode odg odn odo oea oeb oec oed oee oeg oen oeo oga ogc ogd oge ogg ogn ogo on- ona onb onc ond one ong onn ono oo- ooa oob ooc ood oog oon ooo