a-a a-b a-i aaa aab aag aai aap ab- aba abb abg abi abp ag- aga agb agg agi agp ai- aia aib aig aii aip ap- apa apb apg api app b-p baa bab bag bai bap bba bbb bbg bbi bbp bga bgb bgg bgi bgp bi- bia bib big bii bip bpa bpb bpg bpi bpp g-p gaa gab gag gai gap gba gbg gbi gbp gga ggb ggg ggi ggp gia gib gig gii gip gpa gpb gpg gpi gpp ia- iaa iab iag iai iap iba ibb ibg ibi ibp iga igb igg igi igp iia iib iii iip ipa ipb ipg ipi ipp p-p paa pab pag pai pap pba pbb pbg pbi pbp pga pgb pgg pgi pgp pia pib pig pii pip ppa ppb ppg ppi ppp