a-a a-b aaa aab aad aae aag aan ab- aba abb abd abe abg abn ad- ada adb add ade adg adn aea aeb aed aee aeg aen ag- aga agb agd age agg agn an- ana anb and ane ang ann baa bab bad bae bag ban bba bbb bbd bbe bbg bbn bda bdb bdd bde bdg be- bea beb bed bee beg ben bga bgb bgd bge bgg bgn bna bnb bnd bne bng bnn daa dab dad dae dag dan dba dbb dbd dbe dbg dbn dda ddb ddd dde ddg ddn de- dea deb ded dee deg den dga dgd dge dgg dgn dna dnb dnd dne dng dnn eaa eab ead eae eag ean eba ebb ebd ebe ebg ebn ed- eda edb edd ede edg edn eea eeb eed eee eeg een ega egb egd ege egg egn en- ena enb end ene eng enn g-d gaa gab gad gae gag gan gba gbd gbe gbg gbn gda gdb gdd gde gdn ge- gea geb ged gee geg gen gga ggb ggd ggg ggn gna gnb gnd gne gnn naa nab nad nae nag nan nba nbb nbd nbe nbg nbn nda ndb ndd nde ndg ndn ne- nea neb ned nee neg nen nga ngb ngd nge ngg ngn nna nnb nne nng nnn