a-a a-i aaa aaf aag aai aav af- afa aff afg afi afv ag- aga agf agg agi agv ai- aia aif aig aii aiv av- ava avf avg avi faa faf fag fai fav ffa fff ffg ffi ffv fga fgf fgg fgi fgv fia fif fig fii fva fvg gaa gaf gag gai gav gfa gff gfi gga ggg ggi ggv gia gif gig gii giv gva gvf gvg gvi i-f i-v ia- iaa iaf iag iai iav ifa iff ifg ifi iga igf igg igi iia iif iii iva ivf ivg ivi ivv v-a vaa vag vai vav vfa vff vfg vfi vfv vga vgf vgg vi- via vif vig vii viv vva vvg vvi vvv