a-a a-b a-c aaa aab aac aad aae aag aan ab- aba abb abc abd abe abg abn ac- aca acb acc acd ace acg acn ad- ada adb adc add ade adg adn aea aeb aec aed aee aeg aen ag- aga agb agc agd age agg agn an- ana anb anc and ane ang ann baa bab bac bad bae bag ban bba bbb bbc bbd bbe bbg bbn bca bcb bcc bcd bce bcg bcn bda bdb bdc bdd bde bdg be- bea beb bec bed bee beg ben bga bgb bgc bgd bge bgg bgn bna bnb bnc bnd bne bng bnn c-- caa cab cac cad cae cag can cba cbb cbc cbd cbe cbg cbn cca ccb ccc ccd cce ccg ccn cda cdb cdc cdd cde cdg cdn ce- cea ceb cec ced cee ceg cen cga cgb cgc cgd cge cgg cgn cn- cna cnb cnc cnd cne cng cnn daa dab dac dad dae dag dan dba dbb dbc dbd dbe dbg dbn dca dcb dcc dcd dce dcg dcn dda ddb ddc ddd dde ddg ddn de- dea deb dec ded dee deg den dga dgc dgd dge dgg dgn dna dnb dnc dnd dne dng dnn eaa eab eac ead eae eag ean eba ebb ebc ebd ebe ebg ebn ec- eca ecb ecc ecd ece ecg ecn ed- eda edb edc edd ede edg edn eea eeb eec eed eee eeg een ega egb egc egd ege egg egn en- ena enb enc end ene eng enn g-d gaa gab gac gad gae gag gan gba gbc gbd gbe gbg gbn gca gcb gcc gcd gce gcg gcn gda gdb gdc gdd gde gdn ge- gea geb gec ged gee geg gen gga ggb ggc ggd ggg ggn gna gnb gnc gnd gne gnn naa nab nac nad nae nag nan nba nbb nbc nbd nbe nbg nbn nca ncb ncc ncd nce ncg ncn nda ndb ndc ndd nde ndg ndn ne- nea neb nec ned nee neg nen nga ngb ngc ngd nge ngg ngn nna nnb nnc nne nng nnn