a-a a-b a-i aaa aab aad aae aag aai ab- aba abb abd abe abg abi ad- ada adb add ade adg adi aea aeb aed aee aeg aei ag- aga agb agd age agg agi ai- aia aib aid aie aig aii baa bab bad bae bag bai bba bbb bbd bbe bbg bbi bda bdb bdd bde bdg bdi be- bea beb bed bee beg bei bga bgb bgd bge bgg bgi bi- bia bib bid bie big bii daa dab dad dae dag dai dba dbb dbd dbe dbg dbi dda ddb ddd dde ddg ddi de- dea deb ded dee deg dei dga dgd dge dgg dgi di- dia dib did die dig dii eaa eab ead eae eag eai eba ebb ebd ebe ebg ebi ed- eda edb edd ede edg edi eea eeb eed eee eeg ega egb egd ege egg egi eia eib eid eie eig eii g-d gaa gab gad gae gag gai gba gbd gbe gbg gbi gda gdb gdd gde gdi ge- gea geb ged gee geg gei gga ggb ggd ggg ggi gia gib gid gie gig gii i-d ia- iaa iab iad iae iag iai iba ibb ibd ibe ibg ibi ida idb idd ide idg idi ie- iea ied iee ieg iei iga igb igd ige igg igi iia iib iid iie iii